645362658 has 48 divisors (see below), whose sum is σ = 1498550976. Its totient is φ = 200201760.

The previous prime is 645362651. The next prime is 645362677. The reversal of 645362658 is 856263546.

645362658 is a `hidden beast` number, since 64 + 536 + 2 + 6 + 58 = 666.

It is not an unprimeable number, because it can be changed into a prime (645362651) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5748 + ... + 36383.

It is an arithmetic number, because the mean of its divisors is an integer number (31219812).

Almost surely, 2^645362658 is an apocalyptic number.

645362658 is an abundant number, since it is smaller than the sum of its proper divisors (853188318).

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

645362658 is a wasteful number, since it uses less digits than its factorization.

645362658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42199 (or 42196 counting only the distinct ones).

The product of its digits is 1036800, while the sum is 45.

The square root of 645362658 is about 25403.9890174752. The cubic root of 645362658 is about 864.1741627428.

The spelling of 645362658 in words is "six hundred forty-five million, three hundred sixty-two thousand, six hundred fifty-eight".