645037860 has 24 divisors (see below), whose sum is σ = 1806106176. Its totient is φ = 172010080.

The previous prime is 645037853. The next prime is 645037867. The reversal of 645037860 is 68730546.

It is an interprime number because it is at equal distance from previous prime (645037853) and next prime (645037867).

It is not an unprimeable number, because it can be changed into a prime (645037867) 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, 5375256 + ... + 5375375.

It is an arithmetic number, because the mean of its divisors is an integer number (75254424).

Almost surely, 2^645037860 is an apocalyptic number.

645037860 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

645037860 is an abundant number, since it is smaller than the sum of its proper divisors (1161068316).

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

645037860 is a wasteful number, since it uses less digits than its factorization.

645037860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10750643 (or 10750641 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 39.

The square root of 645037860 is about 25397.5955554852. The cubic root of 645037860 is about 864.0291646105.

The spelling of 645037860 in words is "six hundred forty-five million, thirty-seven thousand, eight hundred sixty".