42815645 has 8 divisors (see below), whose sum is σ = 54083040. Its totient is φ = 32449680.

The previous prime is 42815621. The next prime is 42815657. The reversal of 42815645 is 54651824.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-42815645 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 225251 + ... + 225440.

It is an arithmetic number, because the mean of its divisors is an integer number (6760380).

Almost surely, 2^42815645 is an apocalyptic number.

It is an amenable number.

42815645 is a deficient number, since it is larger than the sum of its proper divisors (11267395).

42815645 is a wasteful number, since it uses less digits than its factorization.

42815645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 450715.

The product of its digits is 38400, while the sum is 35.

The square root of 42815645 is about 6543.3664882841. The cubic root of 42815645 is about 349.8384152084.

The spelling of 42815645 in words is "forty-two million, eight hundred fifteen thousand, six hundred forty-five".