687057042 has 32 divisors (see below), whose sum is σ = 1571392512. Its totient is φ = 196179984.

The previous prime is 687057017. The next prime is 687057047. The reversal of 687057042 is 240750786.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (687057047) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80043 + ... + 88209.

It is an arithmetic number, because the mean of its divisors is an integer number (49106016).

Almost surely, 2^687057042 is an apocalyptic number.

687057042 is an abundant number, since it is smaller than the sum of its proper divisors (884335470).

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

687057042 is a wasteful number, since it uses less digits than its factorization.

687057042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10182.

The product of its (nonzero) digits is 94080, while the sum is 39.

The square root of 687057042 is about 26211.7729655970. The cubic root of 687057042 is about 882.3974920726.

The spelling of 687057042 in words is "six hundred eighty-seven million, fifty-seven thousand, forty-two".