647636740 has 48 divisors (see below), whose sum is σ = 1384588800. Its totient is φ = 254403072.

The previous prime is 647636701. The next prime is 647636741. The reversal of 647636740 is 47636746.

It is not an unprimeable number, because it can be changed into a prime (647636741) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 641356 + ... + 642364.

It is an arithmetic number, because the mean of its divisors is an integer number (28845600).

Almost surely, 2^647636740 is an apocalyptic number.

It is an amenable number.

647636740 is an abundant number, since it is smaller than the sum of its proper divisors (736952060).

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

647636740 is a wasteful number, since it uses less digits than its factorization.

647636740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1564 (or 1562 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 43.

The square root of 647636740 is about 25448.7080222160. The cubic root of 647636740 is about 865.1880108546.

The spelling of 647636740 in words is "six hundred forty-seven million, six hundred thirty-six thousand, seven hundred forty".