402066728 has 32 divisors (see below), whose sum is σ = 912254400. Its totient is φ = 162177792.

The previous prime is 402066719. The next prime is 402066761. The reversal of 402066728 is 827660204.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 210218 + ... + 212121.

It is an arithmetic number, because the mean of its divisors is an integer number (28507950).

Almost surely, 2^402066728 is an apocalyptic number.

It is an amenable number.

402066728 is an abundant number, since it is smaller than the sum of its proper divisors (510187672).

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

402066728 is a wasteful number, since it uses less digits than its factorization.

402066728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422369 (or 422365 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 35.

The square root of 402066728 is about 20051.6016317899. The cubic root of 402066728 is about 738.0731022883.

The spelling of 402066728 in words is "four hundred two million, sixty-six thousand, seven hundred twenty-eight".