42644525 has 24 divisors (see below), whose sum is σ = 65930304. Its totient is φ = 26582400.

The previous prime is 42644521. The next prime is 42644527. The reversal of 42644525 is 52544624.

It is not a de Polignac number, because 42644525 - 2² = 42644521 is a prime.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 42644491 and 42644500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42644521) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9152 + ... + 13001.

It is an arithmetic number, because the mean of its divisors is an integer number (2747096).

Almost surely, 2^42644525 is an apocalyptic number.

It is an amenable number.

42644525 is a deficient number, since it is larger than the sum of its proper divisors (23285779).

42644525 is a wasteful number, since it uses less digits than its factorization.

42644525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22181 (or 22176 counting only the distinct ones).

The product of its digits is 38400, while the sum is 32.

The square root of 42644525 is about 6530.2775591854. The cubic root of 42644525 is about 349.3717300372.

Subtracting 42644525 from its reverse (52544624), we obtain a palindrome (9900099).

The spelling of 42644525 in words is "forty-two million, six hundred forty-four thousand, five hundred twenty-five".