642275605 has 4 divisors (see below), whose sum is σ = 770730732. Its totient is φ = 513820480.

The previous prime is 642275597. The next prime is 642275653. The reversal of 642275605 is 506572246.

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

It can be written as a sum of positive squares in 2 ways, for example, as 178863876 + 463411729 = 13374^2 + 21527^2 .

It is not a de Polignac number, because 642275605 - 2³ = 642275597 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 3 ways as a sum of consecutive naturals, for example, 64227556 + ... + 64227565.

It is an arithmetic number, because the mean of its divisors is an integer number (192682683).

Almost surely, 2^642275605 is an apocalyptic number.

It is an amenable number.

642275605 is a deficient number, since it is larger than the sum of its proper divisors (128455127).

642275605 is a wasteful number, since it uses less digits than its factorization.

642275605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128455126.

The product of its (nonzero) digits is 100800, while the sum is 37.

The square root of 642275605 is about 25343.1569659346. The cubic root of 642275605 is about 862.7940516666.

The spelling of 642275605 in words is "six hundred forty-two million, two hundred seventy-five thousand, six hundred five".