642630245 has 8 divisors (see below), whose sum is σ = 791998584. Its totient is φ = 500209344.

The previous prime is 642630229. The next prime is 642630253. The reversal of 642630245 is 542036246.

It can be written as a sum of positive squares in 4 ways, for example, as 35796289 + 606833956 = 5983^2 + 24634^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 642630245 - 2⁴ = 642630229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1736654 + ... + 1737023.

It is an arithmetic number, because the mean of its divisors is an integer number (98999823).

Almost surely, 2^642630245 is an apocalyptic number.

It is an amenable number.

642630245 is a deficient number, since it is larger than the sum of its proper divisors (149368339).

642630245 is a wasteful number, since it uses less digits than its factorization.

642630245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3473719.

The product of its (nonzero) digits is 34560, while the sum is 32.

The square root of 642630245 is about 25350.1527608809. The cubic root of 642630245 is about 862.9528230623.

The spelling of 642630245 in words is "six hundred forty-two million, six hundred thirty thousand, two hundred forty-five".