645854790 has 48 divisors (see below), whose sum is σ = 1803125232. Its totient is φ = 147623616.

The previous prime is 645854779. The next prime is 645854819. The reversal of 645854790 is 97458546.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

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, 218209 + ... + 221148.

It is an arithmetic number, because the mean of its divisors is an integer number (37565109).

Almost surely, 2^645854790 is an apocalyptic number.

645854790 is an abundant number, since it is smaller than the sum of its proper divisors (1157270442).

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

645854790 is a wasteful number, since it uses less digits than its factorization.

645854790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439381 (or 439374 counting only the distinct ones).

The product of its (nonzero) digits is 1209600, while the sum is 48.

The square root of 645854790 is about 25413.6732882124. The cubic root of 645854790 is about 864.3937703779.

The spelling of 645854790 in words is "six hundred forty-five million, eight hundred fifty-four thousand, seven hundred ninety".