642294684 has 144 divisors (see below), whose sum is σ = 1756774656. Its totient is φ = 205027200.

The previous prime is 642294641. The next prime is 642294691. The reversal of 642294684 is 486492246.

It is a super-2 number, since 2×642294684² = 825084922189319712, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2829379 + ... + 2829605.

It is an arithmetic number, because the mean of its divisors is an integer number (12199824).

Almost surely, 2^642294684 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 642294684, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (878387328).

642294684 is an abundant number, since it is smaller than the sum of its proper divisors (1114479972).

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

642294684 is a wasteful number, since it uses less digits than its factorization.

642294684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358 (or 344 counting only the distinct ones).

The product of its digits is 663552, while the sum is 45.

The square root of 642294684 is about 25343.5333763862. The cubic root of 642294684 is about 862.8025947721.

The spelling of 642294684 in words is "six hundred forty-two million, two hundred ninety-four thousand, six hundred eighty-four".