642071364 has 24 divisors (see below), whose sum is σ = 1634363808. Its totient is φ = 194567040.

The previous prime is 642071363. The next prime is 642071377. The reversal of 642071364 is 463170246.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (642071363) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 2431957 + ... + 2432220.

It is an arithmetic number, because the mean of its divisors is an integer number (68098492).

Almost surely, 2^642071364 is an apocalyptic number.

It is an amenable number.

642071364 is an abundant number, since it is smaller than the sum of its proper divisors (992292444).

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

642071364 is a wasteful number, since it uses less digits than its factorization.

642071364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4864195 (or 4864193 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 33.

The square root of 642071364 is about 25339.1271357164. The cubic root of 642071364 is about 862.7025869845.

The spelling of 642071364 in words is "six hundred forty-two million, seventy-one thousand, three hundred sixty-four".