1247072640 has 256 divisors, whose sum is σ = 4378199040. Its totient is φ = 299417600.

The previous prime is 1247072639. The next prime is 1247072641. The reversal of 1247072640 is 462707421.

It is an interprime number because it is at equal distance from previous prime (1247072639) and next prime (1247072641).

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1247072641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2893225 + ... + 2893655.

It is an arithmetic number, because the mean of its divisors is an integer number (17102340).

Almost surely, 2^1247072640 is an apocalyptic number.

1247072640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1247072640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2189099520).

1247072640 is an abundant number, since it is smaller than the sum of its proper divisors (3131126400).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1247072640 is a wasteful number, since it uses less digits than its factorization.

1247072640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 601 (or 589 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 33.

The square root of 1247072640 is about 35313.9156707381. The cubic root of 1247072640 is about 1076.3757802656.

The spelling of 1247072640 in words is "one billion, two hundred forty-seven million, seventy-two thousand, six hundred forty".