72807655 has 4 divisors (see below), whose sum is σ = 87369192. Its totient is φ = 58246120.

The previous prime is 72807629. The next prime is 72807659. The reversal of 72807655 is 55670827.

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

It is a de Polignac number, because none of the positive numbers 2^k-72807655 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72807659) 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, 7280761 + ... + 7280770.

It is an arithmetic number, because the mean of its divisors is an integer number (21842298).

Almost surely, 2^72807655 is an apocalyptic number.

72807655 is a deficient number, since it is larger than the sum of its proper divisors (14561537).

72807655 is a wasteful number, since it uses less digits than its factorization.

72807655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14561536.

The product of its (nonzero) digits is 117600, while the sum is 40.

The square root of 72807655 is about 8532.7401812079. The cubic root of 72807655 is about 417.5665305666.

The spelling of 72807655 in words is "seventy-two million, eight hundred seven thousand, six hundred fifty-five".