649239264 has 72 divisors (see below), whose sum is σ = 1891339632. Its totient is φ = 211130880.

The previous prime is 649239257. The next prime is 649239271. The reversal of 649239264 is 462932946.

It is an interprime number because it is at equal distance from previous prime (649239257) and next prime (649239271).

It is a tau number, because it is divible by the number of its divisors (72).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15684 + ... + 39299.

It is an arithmetic number, because the mean of its divisors is an integer number (26268606).

Almost surely, 2^649239264 is an apocalyptic number.

It is an amenable number.

649239264 is an abundant number, since it is smaller than the sum of its proper divisors (1242100368).

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

649239264 is a wasteful number, since it uses less digits than its factorization.

649239264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55040 (or 55029 counting only the distinct ones).

The product of its digits is 559872, while the sum is 45.

The square root of 649239264 is about 25480.1739397517. The cubic root of 649239264 is about 865.9010353301.

The spelling of 649239264 in words is "six hundred forty-nine million, two hundred thirty-nine thousand, two hundred sixty-four".