72042815 has 16 divisors (see below), whose sum is σ = 96314400. Its totient is φ = 51364992.

The previous prime is 72042809. The next prime is 72042829. The reversal of 72042815 is 51824027.

It is a cyclic number.

It is not a de Polignac number, because 72042815 - 2⁴ = 72042799 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

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, 17225 + ... + 20994.

It is an arithmetic number, because the mean of its divisors is an integer number (6019650).

Almost surely, 2^72042815 is an apocalyptic number.

72042815 is a deficient number, since it is larger than the sum of its proper divisors (24271585).

72042815 is a wasteful number, since it uses less digits than its factorization.

72042815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38266.

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 72042815 is about 8487.8038973577. The cubic root of 72042815 is about 416.0992101120.

The spelling of 72042815 in words is "seventy-two million, forty-two thousand, eight hundred fifteen".