642938152 has 8 divisors (see below), whose sum is σ = 1205509050. Its totient is φ = 321469072.

The previous prime is 642938141. The next prime is 642938173. The reversal of 642938152 is 251839246.

It can be written as a sum of positive squares in only one way, i.e., 512841316 + 130096836 = 22646^2 + 11406^2 .

It is a tau number, because it is divible by the number of its divisors (8).

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 as a sum of consecutive naturals, namely, 40183627 + ... + 40183642.

Almost surely, 2^642938152 is an apocalyptic number.

It is an amenable number.

642938152 is a deficient number, since it is larger than the sum of its proper divisors (562570898).

642938152 is a wasteful number, since it uses less digits than its factorization.

642938152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80367275 (or 80367271 counting only the distinct ones).

The product of its digits is 103680, while the sum is 40.

The square root of 642938152 is about 25356.2251133721. The cubic root of 642938152 is about 863.0906248497.

The spelling of 642938152 in words is "six hundred forty-two million, nine hundred thirty-eight thousand, one hundred fifty-two".