642797125 has 16 divisors (see below), whose sum is σ = 803453040. Its totient is φ = 513441600.

The previous prime is 642797117. The next prime is 642797137. The reversal of 642797125 is 521797246.

It can be written as a sum of positive squares in 8 ways, for example, as 261727684 + 381069441 = 16178^2 + 19521^2 .

It is not a de Polignac number, because 642797125 - 2³ = 642797117 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84999 + ... + 92251.

It is an arithmetic number, because the mean of its divisors is an integer number (50215815).

Almost surely, 2^642797125 is an apocalyptic number.

It is an amenable number.

642797125 is a deficient number, since it is larger than the sum of its proper divisors (160655915).

642797125 is an equidigital number, since it uses as much as digits as its factorization.

642797125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7977 (or 7967 counting only the distinct ones).

The product of its digits is 211680, while the sum is 43.

The square root of 642797125 is about 25353.4440461252. Note that the first 3 decimals coincide. The cubic root of 642797125 is about 863.0275145895.

The spelling of 642797125 in words is "six hundred forty-two million, seven hundred ninety-seven thousand, one hundred twenty-five".