649045256 has 8 divisors (see below), whose sum is σ = 1216959870. Its totient is φ = 324522624.

The previous prime is 649045249. The next prime is 649045273. The reversal of 649045256 is 652540946.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 522122500 + 126922756 = 22850^2 + 11266^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×649045256² = 842519488672211072, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40565321 + ... + 40565336.

Almost surely, 2^649045256 is an apocalyptic number.

It is an amenable number.

649045256 is a deficient number, since it is larger than the sum of its proper divisors (567914614).

649045256 is a wasteful number, since it uses less digits than its factorization.

649045256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81130663 (or 81130659 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 41.

The square root of 649045256 is about 25476.3666169256. The cubic root of 649045256 is about 865.8147761889.

The spelling of 649045256 in words is "six hundred forty-nine million, forty-five thousand, two hundred fifty-six".