645025446 has 24 divisors (see below), whose sum is σ = 1505059920. Its totient is φ = 198469296.

The previous prime is 645025439. The next prime is 645025457. The reversal of 645025446 is 644520546.

645025446 is a `hidden beast` number, since 64 + 50 + 2 + 544 + 6 = 666.

645025446 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 645025446.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1378026 + ... + 1378493.

It is an arithmetic number, because the mean of its divisors is an integer number (62710830).

Almost surely, 2^645025446 is an apocalyptic number.

645025446 is an abundant number, since it is smaller than the sum of its proper divisors (860034474).

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

645025446 is a wasteful number, since it uses less digits than its factorization.

645025446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2756540 (or 2756537 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 36.

The square root of 645025446 is about 25397.3511610955. The cubic root of 645025446 is about 864.0236217179.

The spelling of 645025446 in words is "six hundred forty-five million, twenty-five thousand, four hundred forty-six".