642038670 has 192 divisors, whose sum is σ = 2145407040. Its totient is φ = 135426816.

The previous prime is 642038651. The next prime is 642038699. The reversal of 642038670 is 76830246.

642038670 is a `hidden beast` number, since 642 + 0 + 3 + 8 + 6 + 7 + 0 = 666.

642038670 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 170124 + ... + 173856.

It is an arithmetic number, because the mean of its divisors is an integer number (11173995).

Almost surely, 2^642038670 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 642038670, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1072703520).

642038670 is an abundant number, since it is smaller than the sum of its proper divisors (1503368370).

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

642038670 is a wasteful number, since it uses less digits than its factorization.

642038670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3776 (or 3763 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The square root of 642038670 is about 25338.4819987307. The cubic root of 642038670 is about 862.6879439200.

The spelling of 642038670 in words is "six hundred forty-two million, thirty-eight thousand, six hundred seventy".