645907476 has 24 divisors (see below), whose sum is σ = 1526197120. Its totient is φ = 212576832.

The previous prime is 645907393. The next prime is 645907477. The reversal of 645907476 is 674709546.

645907476 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645907477) 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, 339721 + ... + 341616.

Almost surely, 2^645907476 is an apocalyptic number.

It is an amenable number.

645907476 is an abundant number, since it is smaller than the sum of its proper divisors (880289644).

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

645907476 is a wasteful number, since it uses less digits than its factorization.

645907476 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 681423 (or 681421 counting only the distinct ones).

The product of its (nonzero) digits is 1270080, while the sum is 48.

The square root of 645907476 is about 25414.7098350542. The cubic root of 645907476 is about 864.4172742225.

The spelling of 645907476 in words is "six hundred forty-five million, nine hundred seven thousand, four hundred seventy-six".