646738120 has 64 divisors (see below), whose sum is σ = 1716710400. Its totient is φ = 214583040.

The previous prime is 646738111. The next prime is 646738121. The reversal of 646738120 is 21837646.

It is a super-2 number, since 2×646738120² = 836540391722268800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 646738120.

It is not an unprimeable number, because it can be changed into a prime (646738121) 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, 28575 + ... + 45934.

It is an arithmetic number, because the mean of its divisors is an integer number (26823600).

Almost surely, 2^646738120 is an apocalyptic number.

It is an amenable number.

646738120 is an abundant number, since it is smaller than the sum of its proper divisors (1069972280).

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

646738120 is a wasteful number, since it uses less digits than its factorization.

646738120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74558 (or 74554 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 646738120 is about 25431.0463803596. The cubic root of 646738120 is about 864.7876654801.

The spelling of 646738120 in words is "six hundred forty-six million, seven hundred thirty-eight thousand, one hundred twenty".