645290982 has 32 divisors (see below), whose sum is σ = 1638835200. Its totient is φ = 184368744.

The previous prime is 645290969. The next prime is 645291043. The reversal of 645290982 is 289092546.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 853182 + ... + 853937.

It is an arithmetic number, because the mean of its divisors is an integer number (51213600).

Almost surely, 2^645290982 is an apocalyptic number.

645290982 is an abundant number, since it is smaller than the sum of its proper divisors (993544218).

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

645290982 is a wasteful number, since it uses less digits than its factorization.

645290982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1707137 (or 1707131 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The square root of 645290982 is about 25402.5782549725. The cubic root of 645290982 is about 864.1421689277.

The spelling of 645290982 in words is "six hundred forty-five million, two hundred ninety thousand, nine hundred eighty-two".