642764124 has 36 divisors (see below), whose sum is σ = 1647028656. Its totient is φ = 211318848.

The previous prime is 642764107. The next prime is 642764159. The reversal of 642764124 is 421467246.

642764124 is a `hidden beast` number, since 6 + 4 + 2 + 7 + 641 + 2 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 119664 + ... + 124919.

It is an arithmetic number, because the mean of its divisors is an integer number (45750796).

Almost surely, 2^642764124 is an apocalyptic number.

It is an amenable number.

642764124 is an abundant number, since it is smaller than the sum of its proper divisors (1004264532).

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

642764124 is a wasteful number, since it uses less digits than its factorization.

642764124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244666 (or 244661 counting only the distinct ones).

The product of its digits is 64512, while the sum is 36.

The square root of 642764124 is about 25352.7932188940. The cubic root of 642764124 is about 863.0127451507.

The spelling of 642764124 in words is "six hundred forty-two million, seven hundred sixty-four thousand, one hundred twenty-four".