645382476 has 72 divisors (see below), whose sum is σ = 1677491088. Its totient is φ = 209088000.

The previous prime is 645382429. The next prime is 645382489. The reversal of 645382476 is 674283546.

645382476 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 487896 + ... + 489216.

Almost surely, 2^645382476 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645382476, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (838745544).

645382476 is an abundant number, since it is smaller than the sum of its proper divisors (1032108612).

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

645382476 is a wasteful number, since it uses less digits than its factorization.

645382476 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1703 (or 1698 counting only the distinct ones).

The product of its digits is 967680, while the sum is 45.

The square root of 645382476 is about 25404.3790713334. The cubic root of 645382476 is about 864.1830084298.

The spelling of 645382476 in words is "six hundred forty-five million, three hundred eighty-two thousand, four hundred seventy-six".