642785274 has 16 divisors (see below), whose sum is σ = 1428411840. Its totient is φ = 214261740.

The previous prime is 642785263. The next prime is 642785291. The reversal of 642785274 is 472587246.

It is a happy number.

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, 5951662 + ... + 5951769.

It is an arithmetic number, because the mean of its divisors is an integer number (89275740).

Almost surely, 2^642785274 is an apocalyptic number.

642785274 is an abundant number, since it is smaller than the sum of its proper divisors (785626566).

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

642785274 is a wasteful number, since it uses less digits than its factorization.

642785274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11903442 (or 11903436 counting only the distinct ones).

The product of its digits is 752640, while the sum is 45.

The square root of 642785274 is about 25353.2103292660. The cubic root of 642785274 is about 863.0222107896.

The spelling of 642785274 in words is "six hundred forty-two million, seven hundred eighty-five thousand, two hundred seventy-four".