642817025 has 24 divisors (see below), whose sum is σ = 847416000. Its totient is φ = 482328000.

The previous prime is 642817013. The next prime is 642817027. The reversal of 642817025 is 520718246.

It is not a de Polignac number, because 642817025 - 2⁴ = 642817009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (642817027) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 41276 + ... + 54674.

It is an arithmetic number, because the mean of its divisors is an integer number (35309000).

Almost surely, 2^642817025 is an apocalyptic number.

It is an amenable number.

642817025 is a deficient number, since it is larger than the sum of its proper divisors (204598975).

642817025 is a wasteful number, since it uses less digits than its factorization.

642817025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13529 (or 13524 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 642817025 is about 25353.8364947004. The cubic root of 642817025 is about 863.0364204945.

The spelling of 642817025 in words is "six hundred forty-two million, eight hundred seventeen thousand, twenty-five".