649697760 has 120 divisors (see below), whose sum is σ = 2292937416. Its totient is φ = 173249280.

The previous prime is 649697753. The next prime is 649697771. The reversal of 649697760 is 67796946.

649697760 is a `hidden beast` number, since 6 + 496 + 97 + 7 + 60 = 666.

649697760 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 (120).

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

It is a junction number, because it is equal to n+sod(n) for n = 649697697 and 649697706.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 12106 + ... + 38025.

Almost surely, 2^649697760 is an apocalyptic number.

649697760 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

649697760 is an abundant number, since it is smaller than the sum of its proper divisors (1643239656).

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

649697760 is a wasteful number, since it uses less digits than its factorization.

649697760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50158 (or 50141 counting only the distinct ones).

The product of its (nonzero) digits is 3429216, while the sum is 54.

The square root of 649697760 is about 25489.1694646962. The cubic root of 649697760 is about 866.1048219064.

The spelling of 649697760 in words is "six hundred forty-nine million, six hundred ninety-seven thousand, seven hundred sixty".