72785897 has 4 divisors (see below), whose sum is σ = 73163220. Its totient is φ = 72408576.

The previous prime is 72785887. The next prime is 72785917. The reversal of 72785897 is 79858727.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 36917776 + 35868121 = 6076^2 + 5989^2 .

It is a cyclic number.

It is not a de Polignac number, because 72785897 - 2⁶ = 72785833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72785807) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 188372 + ... + 188757.

It is an arithmetic number, because the mean of its divisors is an integer number (18290805).

Almost surely, 2^72785897 is an apocalyptic number.

It is an amenable number.

72785897 is a deficient number, since it is larger than the sum of its proper divisors (377323).

72785897 is a wasteful number, since it uses less digits than its factorization.

72785897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377322.

The product of its digits is 1975680, while the sum is 53.

The square root of 72785897 is about 8531.4651145041. The cubic root of 72785897 is about 417.5249309219.

The spelling of 72785897 in words is "seventy-two million, seven hundred eighty-five thousand, eight hundred ninety-seven".