402557256676 has 27 divisors (see below), whose sum is σ = 748392651867. Its totient is φ = 189428557440.

The previous prime is 402557256671. The next prime is 402557256721. The reversal of 402557256676 is 676652755204.

The square root of 402557256676 is 634474.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 14149102500 + 388408154176 = 118950^2 + 623224^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402557256671) 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 8 ways as a sum of consecutive naturals, for example, 21562786 + ... + 21581446.

Almost surely, 2^402557256676 is an apocalyptic number.

402557256676 is the 634474-th square number.

It is an amenable number.

402557256676 is a deficient number, since it is larger than the sum of its proper divisors (345835395191).

402557256676 is an frugal number, since it uses more digits than its factorization.

402557256676 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37360 (or 18680 counting only the distinct ones).

The product of its (nonzero) digits is 21168000, while the sum is 55.

The spelling of 402557256676 in words is "four hundred two billion, five hundred fifty-seven million, two hundred fifty-six thousand, six hundred seventy-six".