649261920 has 96 divisors (see below), whose sum is σ = 2152846080. Its totient is φ = 164021760.

The previous prime is 649261913. The next prime is 649261931. The reversal of 649261920 is 29162946.

649261920 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (96).

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

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, 26476 + ... + 44715.

It is an arithmetic number, because the mean of its divisors is an integer number (22425480).

Almost surely, 2^649261920 is an apocalyptic number.

649261920 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

649261920 is an abundant number, since it is smaller than the sum of its proper divisors (1503584160).

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

649261920 is a wasteful number, since it uses less digits than its factorization.

649261920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71228 (or 71220 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 39.

The square root of 649261920 is about 25480.6185168257. The cubic root of 649261920 is about 865.9111074390.

The spelling of 649261920 in words is "six hundred forty-nine million, two hundred sixty-one thousand, nine hundred twenty".