649672920 has 128 divisors (see below), whose sum is σ = 2332209600. Its totient is φ = 159916032.

The previous prime is 649672913. The next prime is 649672931. The reversal of 649672920 is 29276946.

649672920 is a `hidden beast` number, since 6 + 496 + 72 + 92 + 0 = 666.

649672920 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9097 + ... + 37176.

Almost surely, 2^649672920 is an apocalyptic number.

649672920 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 649672920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1166104800).

649672920 is an abundant number, since it is smaller than the sum of its proper divisors (1682536680).

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

649672920 is a wasteful number, since it uses less digits than its factorization.

649672920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46306 (or 46296 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The square root of 649672920 is about 25488.6821942603. The cubic root of 649672920 is about 866.0937837903.

The spelling of 649672920 in words is "six hundred forty-nine million, six hundred seventy-two thousand, nine hundred twenty".