642995370 has 48 divisors (see below), whose sum is σ = 1673242272. Its totient is φ = 171316320.

The previous prime is 642995351. The next prime is 642995399. The reversal of 642995370 is 73599246.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 134725 + ... + 139415.

It is an arithmetic number, because the mean of its divisors is an integer number (34859214).

Almost surely, 2^642995370 is an apocalyptic number.

642995370 is an abundant number, since it is smaller than the sum of its proper divisors (1030246902).

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

642995370 is a wasteful number, since it uses less digits than its factorization.

642995370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6227 (or 6224 counting only the distinct ones).

The product of its (nonzero) digits is 408240, while the sum is 45.

The square root of 642995370 is about 25357.3533713596. The cubic root of 642995370 is about 863.1162275480.

The spelling of 642995370 in words is "six hundred forty-two million, nine hundred ninety-five thousand, three hundred seventy".