1264756220 has 96 divisors (see below), whose sum is σ = 3276768768. Its totient is φ = 399313152.

The previous prime is 1264756169. The next prime is 1264756243. The reversal of 1264756220 is 226574621.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1431899 + ... + 1432781.

It is an arithmetic number, because the mean of its divisors is an integer number (34133008).

Almost surely, 2^1264756220 is an apocalyptic number.

1264756220 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 1264756220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1638384384).

1264756220 is an abundant number, since it is smaller than the sum of its proper divisors (2012012548).

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

1264756220 is a wasteful number, since it uses less digits than its factorization.

1264756220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1699 (or 1697 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 35.

The square root of 1264756220 is about 35563.4112537029. The cubic root of 1264756220 is about 1081.4396153809.

The spelling of 1264756220 in words is "one billion, two hundred sixty-four million, seven hundred fifty-six thousand, two hundred twenty".