645969470 has 16 divisors (see below), whose sum is σ = 1163302128. Its totient is φ = 258264000.

The previous prime is 645969469. The next prime is 645969479. The reversal of 645969470 is 74969546.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645969479) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8162 + ... + 36858.

It is an arithmetic number, because the mean of its divisors is an integer number (72706383).

Almost surely, 2^645969470 is an apocalyptic number.

645969470 is a deficient number, since it is larger than the sum of its proper divisors (517332658).

645969470 is a wasteful number, since it uses less digits than its factorization.

645969470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30955.

The product of its (nonzero) digits is 1632960, while the sum is 50.

The square root of 645969470 is about 25415.9294537894. The cubic root of 645969470 is about 864.4449288388. Note that the first 3 decimals are identical.

The spelling of 645969470 in words is "six hundred forty-five million, nine hundred sixty-nine thousand, four hundred seventy".