649299760 has 40 divisors (see below), whose sum is σ = 1510702416. Its totient is φ = 259534080.

The previous prime is 649299737. The next prime is 649299769. The reversal of 649299760 is 67992946.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 649299698 and 649299707.

It is not an unprimeable number, because it can be changed into a prime (649299769) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 185547 + ... + 189013.

Almost surely, 2^649299760 is an apocalyptic number.

It is an amenable number.

649299760 is an abundant number, since it is smaller than the sum of its proper divisors (861402656).

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

649299760 is a wasteful number, since it uses less digits than its factorization.

649299760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5821 (or 5815 counting only the distinct ones).

The product of its (nonzero) digits is 1469664, while the sum is 52.

The square root of 649299760 is about 25481.3610311537. The cubic root of 649299760 is about 865.9279293300.

The spelling of 649299760 in words is "six hundred forty-nine million, two hundred ninety-nine thousand, seven hundred sixty".