646802428 has 24 divisors (see below), whose sum is σ = 1175161680. Its totient is φ = 311122560.

The previous prime is 646802363. The next prime is 646802441. The reversal of 646802428 is 824208646.

It is a congruent number.

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, 22675 + ... + 42517.

It is an arithmetic number, because the mean of its divisors is an integer number (48965070).

Almost surely, 2^646802428 is an apocalyptic number.

It is an amenable number.

646802428 is a deficient number, since it is larger than the sum of its proper divisors (528359252).

646802428 is a wasteful number, since it uses less digits than its factorization.

646802428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20157 (or 20155 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 40.

The square root of 646802428 is about 25432.3107090174. The cubic root of 646802428 is about 864.8163277368.

The spelling of 646802428 in words is "six hundred forty-six million, eight hundred two thousand, four hundred twenty-eight".