646154636 has 24 divisors (see below), whose sum is σ = 1169026320. Its totient is φ = 312302592.

The previous prime is 646154627. The next prime is 646154651. The reversal of 646154636 is 636451646.

It is a junction number, because it is equal to n+sod(n) for n = 646154593 and 646154602.

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, 2681 + ... + 36048.

It is an arithmetic number, because the mean of its divisors is an integer number (48709430).

Almost surely, 2^646154636 is an apocalyptic number.

It is an amenable number.

646154636 is a deficient number, since it is larger than the sum of its proper divisors (522871684).

646154636 is a wasteful number, since it uses less digits than its factorization.

646154636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38873 (or 38871 counting only the distinct ones).

The product of its digits is 311040, while the sum is 41.

The square root of 646154636 is about 25419.5719082757. The cubic root of 646154636 is about 864.5275181485.

The spelling of 646154636 in words is "six hundred forty-six million, one hundred fifty-four thousand, six hundred thirty-six".