642259792 has 10 divisors (see below), whose sum is σ = 1244378378. Its totient is φ = 321129888.

The previous prime is 642259771. The next prime is 642259819. The reversal of 642259792 is 297952246.

It can be written as a sum of positive squares in only one way, i.e., 417139776 + 225120016 = 20424^2 + 15004^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20070603 + ... + 20070634.

Almost surely, 2^642259792 is an apocalyptic number.

It is an amenable number.

642259792 is a deficient number, since it is larger than the sum of its proper divisors (602118586).

642259792 is a wasteful number, since it uses less digits than its factorization.

642259792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40141245 (or 40141239 counting only the distinct ones).

The product of its digits is 544320, while the sum is 46.

The square root of 642259792 is about 25342.8449863073. The cubic root of 642259792 is about 862.7869708671.

The spelling of 642259792 in words is "six hundred forty-two million, two hundred fifty-nine thousand, seven hundred ninety-two".