646630475 has 24 divisors (see below), whose sum is σ = 836946432. Its totient is φ = 495123200.

The previous prime is 646630469. The next prime is 646630483. The reversal of 646630475 is 574036646.

It is not a de Polignac number, because 646630475 - 2²⁰ = 645581899 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 48374 + ... + 60276.

It is an arithmetic number, because the mean of its divisors is an integer number (34872768).

Almost surely, 2^646630475 is an apocalyptic number.

646630475 is a deficient number, since it is larger than the sum of its proper divisors (190315957).

646630475 is a wasteful number, since it uses less digits than its factorization.

646630475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12007 (or 12002 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 41.

The square root of 646630475 is about 25428.9298831075. The cubic root of 646630475 is about 864.7396835481.

The spelling of 646630475 in words is "six hundred forty-six million, six hundred thirty thousand, four hundred seventy-five".