747666647 has 72 divisors (see below), whose sum is σ = 1027411776. Its totient is φ = 540094464.

The previous prime is 747666631. The next prime is 747666737. The reversal of 747666647 is 746666747.

It is not a de Polignac number, because 747666647 - 2⁴ = 747666631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (747666617) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 6616463 + ... + 6616575.

It is an arithmetic number, because the mean of its divisors is an integer number (14269608).

Almost surely, 2^747666647 is an apocalyptic number.

747666647 is a deficient number, since it is larger than the sum of its proper divisors (279745129).

747666647 is a wasteful number, since it uses less digits than its factorization.

747666647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217 (or 197 counting only the distinct ones).

The product of its digits is 7112448, while the sum is 53.

The square root of 747666647 is about 27343.4936867987. The cubic root of 747666647 is about 907.6170989806.

The spelling of 747666647 in words is "seven hundred forty-seven million, six hundred sixty-six thousand, six hundred forty-seven".