40857656528 has 80 divisors (see below), whose sum is σ = 88763141712. Its totient is φ = 18095616000.

The previous prime is 40857656491. The next prime is 40857656549. The reversal of 40857656528 is 82565675804.

It can be written as a sum of positive squares in 8 ways, for example, as 12292600384 + 28565056144 = 110872^2 + 169012^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 480938 + ... + 559478.

Almost surely, 2^40857656528 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40857656528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44381570856).

40857656528 is an abundant number, since it is smaller than the sum of its proper divisors (47905485184).

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

40857656528 is a wasteful number, since it uses less digits than its factorization.

40857656528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78664 (or 78658 counting only the distinct ones).

The product of its (nonzero) digits is 16128000, while the sum is 56.

The spelling of 40857656528 in words is "forty billion, eight hundred fifty-seven million, six hundred fifty-six thousand, five hundred twenty-eight".