642814494 has 32 divisors (see below), whose sum is σ = 1489424640. Its totient is φ = 181144512.

The previous prime is 642814477. The next prime is 642814531. The reversal of 642814494 is 494418246.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 101764 + ... + 107895.

It is an arithmetic number, because the mean of its divisors is an integer number (46544520).

Almost surely, 2^642814494 is an apocalyptic number.

642814494 is an abundant number, since it is smaller than the sum of its proper divisors (846610146).

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

642814494 is a wasteful number, since it uses less digits than its factorization.

642814494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209744.

The product of its digits is 221184, while the sum is 42.

The square root of 642814494 is about 25353.7865811007. The cubic root of 642814494 is about 863.0352877989.

The spelling of 642814494 in words is "six hundred forty-two million, eight hundred fourteen thousand, four hundred ninety-four".