642952017 has 12 divisors (see below), whose sum is σ = 943934004. Its totient is φ = 421607520.

The previous prime is 642951989. The next prime is 642952027. The reversal of 642952017 is 710259246.

642952017 is a `hidden beast` number, since 642 + 9 + 5 + 2 + 0 + 1 + 7 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 19501056 + 623450961 = 4416^2 + 24969^2 .

It is not a de Polignac number, because 642952017 - 2⁷ = 642951889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (642952027) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 585018 + ... + 586115.

It is an arithmetic number, because the mean of its divisors is an integer number (78661167).

Almost surely, 2^642952017 is an apocalyptic number.

It is an amenable number.

642952017 is a deficient number, since it is larger than the sum of its proper divisors (300981987).

642952017 is a wasteful number, since it uses less digits than its factorization.

642952017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1171200 (or 1171197 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 642952017 is about 25356.4985161595. The cubic root of 642952017 is about 863.0968290056.

The spelling of 642952017 in words is "six hundred forty-two million, nine hundred fifty-two thousand, seventeen".