642782875 has 32 divisors (see below), whose sum is σ = 932405760. Its totient is φ = 433260000.

The previous prime is 642782873. The next prime is 642782893. The reversal of 642782875 is 578287246.

It is not a de Polignac number, because 642782875 - 2¹ = 642782873 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (642782873) 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 31 ways as a sum of consecutive naturals, for example, 45400 + ... + 57850.

It is an arithmetic number, because the mean of its divisors is an integer number (29137680).

Almost surely, 2^642782875 is an apocalyptic number.

642782875 is a deficient number, since it is larger than the sum of its proper divisors (289622885).

642782875 is a wasteful number, since it uses less digits than its factorization.

642782875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12532 (or 12522 counting only the distinct ones).

The product of its digits is 1505280, while the sum is 49.

The square root of 642782875 is about 25353.1630176592. The cubic root of 642782875 is about 863.0211371326.

The spelling of 642782875 in words is "six hundred forty-two million, seven hundred eighty-two thousand, eight hundred seventy-five".