40231756728 has 64 divisors (see below), whose sum is σ = 114132672000. Its totient is φ = 13125250656.

The previous prime is 40231756687. The next prime is 40231756729. The reversal of 40231756728 is 82765713204.

40231756728 is a `hidden beast` number, since 40 + 23 + 1 + 7 + 567 + 28 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40231756729) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1971318 + ... + 1991621.

It is an arithmetic number, because the mean of its divisors is an integer number (1783323000).

Almost surely, 2^40231756728 is an apocalyptic number.

It is an amenable number.

40231756728 is an abundant number, since it is smaller than the sum of its proper divisors (73900915272).

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

40231756728 is a wasteful number, since it uses less digits than its factorization.

40231756728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3963001 (or 3962991 counting only the distinct ones).

The product of its (nonzero) digits is 564480, while the sum is 45.

The spelling of 40231756728 in words is "forty billion, two hundred thirty-one million, seven hundred fifty-six thousand, seven hundred twenty-eight".