642225715 has 4 divisors (see below), whose sum is σ = 770670864. Its totient is φ = 513780568.

The previous prime is 642225673. The next prime is 642225737. The reversal of 642225715 is 517522246.

642225715 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 642225715 - 2⁷ = 642225587 is a prime.

It is a super-2 number, since 2×642225715² = 824907738014522450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64222567 + ... + 64222576.

It is an arithmetic number, because the mean of its divisors is an integer number (192667716).

Almost surely, 2^642225715 is an apocalyptic number.

642225715 is a deficient number, since it is larger than the sum of its proper divisors (128445149).

642225715 is a wasteful number, since it uses less digits than its factorization.

642225715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128445148.

The product of its digits is 33600, while the sum is 34.

The square root of 642225715 is about 25342.1726574499. The cubic root of 642225715 is about 862.7717113558.

The spelling of 642225715 in words is "six hundred forty-two million, two hundred twenty-five thousand, seven hundred fifteen".