42511644 has 36 divisors (see below), whose sum is σ = 122812144. Its totient is φ = 12146112.

The previous prime is 42511643. The next prime is 42511657. The reversal of 42511644 is 44611524.

42511644 is a `hidden beast` number, since 4 + 2 + 5 + 11 + 644 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42511643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 84097 + ... + 84600.

Almost surely, 2^42511644 is an apocalyptic number.

It is an amenable number.

42511644 is an abundant number, since it is smaller than the sum of its proper divisors (80300500).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42511644 is a wasteful number, since it uses less digits than its factorization.

42511644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168714 (or 168709 counting only the distinct ones).

The product of its digits is 3840, while the sum is 27.

The square root of 42511644 is about 6520.0953980751. The cubic root of 42511644 is about 349.0084698946.

The spelling of 42511644 in words is "forty-two million, five hundred eleven thousand, six hundred forty-four".