642895072 has 12 divisors (see below), whose sum is σ = 1265699736. Its totient is φ = 321447520.

The previous prime is 642895067. The next prime is 642895087. The reversal of 642895072 is 270598246.

It is a congruent number.

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, 10045204 + ... + 10045267.

It is an arithmetic number, because the mean of its divisors is an integer number (105474978).

Almost surely, 2^642895072 is an apocalyptic number.

It is an amenable number.

642895072 is a deficient number, since it is larger than the sum of its proper divisors (622804664).

642895072 is a wasteful number, since it uses less digits than its factorization.

642895072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20090481 (or 20090473 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 43.

The square root of 642895072 is about 25355.3756036072. The cubic root of 642895072 is about 863.0713473218.

The spelling of 642895072 in words is "six hundred forty-two million, eight hundred ninety-five thousand, seventy-two".