402708640 has 24 divisors (see below), whose sum is σ = 951399540. Its totient is φ = 161083392.

The previous prime is 402708497. The next prime is 402708673. The reversal of 402708640 is 46807204.

It can be written as a sum of positive squares in 2 ways, for example, as 329640336 + 73068304 = 18156^2 + 8548^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1258305 + ... + 1258624.

Almost surely, 2^402708640 is an apocalyptic number.

402708640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

402708640 is an abundant number, since it is smaller than the sum of its proper divisors (548690900).

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

402708640 is a wasteful number, since it uses less digits than its factorization.

402708640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2516944 (or 2516936 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 31.

The square root of 402708640 is about 20067.6017500846. The cubic root of 402708640 is about 738.4656789743.

The spelling of 402708640 in words is "four hundred two million, seven hundred eight thousand, six hundred forty".