42644555 has 4 divisors (see below), whose sum is σ = 51173472. Its totient is φ = 34115640.

The previous prime is 42644543. The next prime is 42644573. The reversal of 42644555 is 55544624.

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

It is not a de Polignac number, because 42644555 - 2⁶ = 42644491 is a prime.

It is a super-2 number, since 2×42644555² = 3637116142296050, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 12.

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, 4264451 + ... + 4264460.

It is an arithmetic number, because the mean of its divisors is an integer number (12793368).

Almost surely, 2^42644555 is an apocalyptic number.

42644555 is a deficient number, since it is larger than the sum of its proper divisors (8528917).

42644555 is an equidigital number, since it uses as much as digits as its factorization.

42644555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8528916.

The product of its digits is 96000, while the sum is 35.

The square root of 42644555 is about 6530.2798561777. The cubic root of 42644555 is about 349.3718119637.

The spelling of 42644555 in words is "forty-two million, six hundred forty-four thousand, five hundred fifty-five".