645757194 has 16 divisors (see below), whose sum is σ = 1315883232. Its totient is φ = 211190928.

The previous prime is 645757169. The next prime is 645757219. The reversal of 645757194 is 491757546.

It is an interprime number because it is at equal distance from previous prime (645757169) and next prime (645757219).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1015024 + ... + 1015659.

It is an arithmetic number, because the mean of its divisors is an integer number (82242702).

Almost surely, 2^645757194 is an apocalyptic number.

645757194 is an abundant number, since it is smaller than the sum of its proper divisors (670126038).

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

645757194 is a wasteful number, since it uses less digits than its factorization.

645757194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2030741.

The product of its digits is 1058400, while the sum is 48.

The square root of 645757194 is about 25411.7530682163. The cubic root of 645757194 is about 864.3502282766.

The spelling of 645757194 in words is "six hundred forty-five million, seven hundred fifty-seven thousand, one hundred ninety-four".