646154992 has 20 divisors (see below), whose sum is σ = 1430772016. Its totient is φ = 276923520.

The previous prime is 646154953. The next prime is 646155007. The reversal of 646154992 is 299451646.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2884509 + ... + 2884732.

Almost surely, 2^646154992 is an apocalyptic number.

It is an amenable number.

646154992 is an abundant number, since it is smaller than the sum of its proper divisors (784617024).

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

646154992 is a wasteful number, since it uses less digits than its factorization.

646154992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5769256 (or 5769250 counting only the distinct ones).

The product of its digits is 466560, while the sum is 46.

The square root of 646154992 is about 25419.5789107530. The cubic root of 646154992 is about 864.5276769195.

The spelling of 646154992 in words is "six hundred forty-six million, one hundred fifty-four thousand, nine hundred ninety-two".