649438992 has 80 divisors (see below), whose sum is σ = 1928448000. Its totient is φ = 209010816.

The previous prime is 649438957. The next prime is 649439003. The reversal of 649438992 is 299834946.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13392 + ... + 38447.

It is an arithmetic number, because the mean of its divisors is an integer number (24105600).

Almost surely, 2^649438992 is an apocalyptic number.

It is an amenable number.

649438992 is an abundant number, since it is smaller than the sum of its proper divisors (1279009008).

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

649438992 is a wasteful number, since it uses less digits than its factorization.

649438992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51885 (or 51873 counting only the distinct ones).

The product of its digits is 3359232, while the sum is 54.

The square root of 649438992 is about 25484.0929208791. The cubic root of 649438992 is about 865.9898197275.

The spelling of 649438992 in words is "six hundred forty-nine million, four hundred thirty-eight thousand, nine hundred ninety-two".