647632755 has 72 divisors (see below), whose sum is σ = 1424605104. Its totient is φ = 269136000.

The previous prime is 647632751. The next prime is 647632807. The reversal of 647632755 is 557236746.

647632755 is a `hidden beast` number, since 6 + 4 + 7 + 632 + 7 + 5 + 5 = 666.

It is not a de Polignac number, because 647632755 - 2² = 647632751 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 647632755.

It is not an unprimeable number, because it can be changed into a prime (647632751) 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, 10905 + ... + 37605.

It is an arithmetic number, because the mean of its divisors is an integer number (19786182).

Almost surely, 2^647632755 is an apocalyptic number.

647632755 is an abundant number, since it is smaller than the sum of its proper divisors (776972349).

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

647632755 is a wasteful number, since it uses less digits than its factorization.

647632755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26737 (or 26727 counting only the distinct ones).

The product of its digits is 1058400, while the sum is 45.

The square root of 647632755 is about 25448.6297273547. The cubic root of 647632755 is about 865.1862363098.

The spelling of 647632755 in words is "six hundred forty-seven million, six hundred thirty-two thousand, seven hundred fifty-five".