645563630 has 8 divisors (see below), whose sum is σ = 1162014552. Its totient is φ = 258225448.

The previous prime is 645563621. The next prime is 645563647. The reversal of 645563630 is 36365546.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32278172 + ... + 32278191.

It is an arithmetic number, because the mean of its divisors is an integer number (145251819).

Almost surely, 2^645563630 is an apocalyptic number.

645563630 is a deficient number, since it is larger than the sum of its proper divisors (516450922).

645563630 is a wasteful number, since it uses less digits than its factorization.

645563630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64556370.

The product of its (nonzero) digits is 194400, while the sum is 38.

The square root of 645563630 is about 25407.9442301025. The cubic root of 645563630 is about 864.2638574195.

It can be divided in two parts, 64556 and 3630, that added together give a palindrome (68186).

The spelling of 645563630 in words is "six hundred forty-five million, five hundred sixty-three thousand, six hundred thirty".