647376987 has 16 divisors (see below), whose sum is σ = 912620160. Its totient is φ = 407060352.

The previous prime is 647376971. The next prime is 647377069. The reversal of 647376987 is 789673746.

It is not a de Polignac number, because 647376987 - 2⁴ = 647376971 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is not an unprimeable number, because it can be changed into a prime (647376967) 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, 12078 + ... + 37955.

It is an arithmetic number, because the mean of its divisors is an integer number (57038760).

Almost surely, 2^647376987 is an apocalyptic number.

647376987 is a deficient number, since it is larger than the sum of its proper divisors (265243173).

647376987 is a wasteful number, since it uses less digits than its factorization.

647376987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50282.

The product of its digits is 10668672, while the sum is 57.

The square root of 647376987 is about 25443.6040489550. The cubic root of 647376987 is about 865.0723260272.

The spelling of 647376987 in words is "six hundred forty-seven million, three hundred seventy-six thousand, nine hundred eighty-seven".