72070815 has 16 divisors (see below), whose sum is σ = 119033856. Its totient is φ = 37197600.

The previous prime is 72070811. The next prime is 72070841. The reversal of 72070815 is 51807027.

It is a happy number.

It is not a de Polignac number, because 72070815 - 2² = 72070811 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72070811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77031 + ... + 77960.

It is an arithmetic number, because the mean of its divisors is an integer number (7439616).

Almost surely, 2^72070815 is an apocalyptic number.

72070815 is a deficient number, since it is larger than the sum of its proper divisors (46963041).

72070815 is a wasteful number, since it uses less digits than its factorization.

72070815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155030.

The product of its (nonzero) digits is 3920, while the sum is 30.

The square root of 72070815 is about 8489.4531626012. The cubic root of 72070815 is about 416.1531098604.

The spelling of 72070815 in words is "seventy-two million, seventy thousand, eight hundred fifteen".