642023604 has 96 divisors (see below), whose sum is σ = 1782144000. Its totient is φ = 199270368.

The previous prime is 642023579. The next prime is 642023621. The reversal of 642023604 is 406320246.

642023604 is a `hidden beast` number, since 6 + 420 + 236 + 0 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 118417 + ... + 123719.

It is an arithmetic number, because the mean of its divisors is an integer number (18564000).

Almost surely, 2^642023604 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 642023604, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (891072000).

642023604 is an abundant number, since it is smaller than the sum of its proper divisors (1140120396).

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

642023604 is a wasteful number, since it uses less digits than its factorization.

642023604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5394 (or 5386 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

The square root of 642023604 is about 25338.1847021447. The cubic root of 642023604 is about 862.6811959577.

The spelling of 642023604 in words is "six hundred forty-two million, twenty-three thousand, six hundred four".