40128463640 has 32 divisors (see below), whose sum is σ = 90309854880. Its totient is φ = 16047685632.

The previous prime is 40128463633. The next prime is 40128463643. The reversal of 40128463640 is 4636482104.

It is a super-2 number, since 2×40128463640² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 40128463594 and 40128463603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40128463643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63512 + ... + 290328.

It is an arithmetic number, because the mean of its divisors is an integer number (2822182965).

Almost surely, 2^40128463640 is an apocalyptic number.

40128463640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40128463640 is an abundant number, since it is smaller than the sum of its proper divisors (50181391240).

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

40128463640 is a wasteful number, since it uses less digits than its factorization.

40128463640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231251 (or 231247 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 38.

The spelling of 40128463640 in words is "forty billion, one hundred twenty-eight million, four hundred sixty-three thousand, six hundred forty".