72765815 has 8 divisors (see below), whose sum is σ = 87384528. Its totient is φ = 58168960.

The previous prime is 72765799. The next prime is 72765817. The reversal of 72765815 is 51856727.

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

It is not a de Polignac number, because 72765815 - 2⁴ = 72765799 is a prime.

It is a super-2 number, since 2×72765815² = 10589727665228450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72765817) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3080 + ... + 12450.

It is an arithmetic number, because the mean of its divisors is an integer number (10923066).

Almost surely, 2^72765815 is an apocalyptic number.

72765815 is a deficient number, since it is larger than the sum of its proper divisors (14618713).

72765815 is a wasteful number, since it uses less digits than its factorization.

72765815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10929.

The product of its digits is 117600, while the sum is 41.

The square root of 72765815 is about 8530.2880959555. The cubic root of 72765815 is about 417.4865283042.

The spelling of 72765815 in words is "seventy-two million, seven hundred sixty-five thousand, eight hundred fifteen".