645320234 has 8 divisors (see below), whose sum is σ = 1042440420. Its totient is φ = 297840096.

The previous prime is 645320227. The next prime is 645320243. The reversal of 645320234 is 432023546.

It can be written as a sum of positive squares in 2 ways, for example, as 633780625 + 11539609 = 25175^2 + 3397^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 645320197 and 645320206.

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, 12409979 + ... + 12410030.

Almost surely, 2^645320234 is an apocalyptic number.

645320234 is a deficient number, since it is larger than the sum of its proper divisors (397120186).

645320234 is a wasteful number, since it uses less digits than its factorization.

645320234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24820024.

The product of its (nonzero) digits is 17280, while the sum is 29.

The square root of 645320234 is about 25403.1540167752. The cubic root of 645320234 is about 864.1552263470.

The spelling of 645320234 in words is "six hundred forty-five million, three hundred twenty thousand, two hundred thirty-four".