642274405 has 16 divisors (see below), whose sum is σ = 786515184. Its totient is φ = 503326720.

The previous prime is 642274387. The next prime is 642274417. The reversal of 642274405 is 504472246.

It can be written as a sum of positive squares in 8 ways, for example, as 78021889 + 564252516 = 8833^2 + 23754^2 .

It is not a de Polignac number, because 642274405 - 2⁷ = 642274277 is a prime.

It is a super-2 number, since 2×642274405² = 825032822636208050, which contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 209685 + ... + 212725.

It is an arithmetic number, because the mean of its divisors is an integer number (49157199).

Almost surely, 2^642274405 is an apocalyptic number.

It is an amenable number.

642274405 is a deficient number, since it is larger than the sum of its proper divisors (144240779).

642274405 is a wasteful number, since it uses less digits than its factorization.

642274405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3896.

The product of its (nonzero) digits is 53760, while the sum is 34.

The square root of 642274405 is about 25343.1332908936. The cubic root of 642274405 is about 862.7935143305.

The spelling of 642274405 in words is "six hundred forty-two million, two hundred seventy-four thousand, four hundred five".