72729665 has 16 divisors (see below), whose sum is σ = 88482240. Its totient is φ = 57385920.

The previous prime is 72729661. The next prime is 72729673. The reversal of 72729665 is 56692727.

It is not a de Polignac number, because 72729665 - 2² = 72729661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72729661) 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, 157535 + ... + 157995.

It is an arithmetic number, because the mean of its divisors is an integer number (5530140).

Almost surely, 2^72729665 is an apocalyptic number.

It is an amenable number.

72729665 is a deficient number, since it is larger than the sum of its proper divisors (15752575).

72729665 is a wasteful number, since it uses less digits than its factorization.

72729665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 832.

The product of its digits is 317520, while the sum is 44.

The square root of 72729665 is about 8528.1689124923. The cubic root of 72729665 is about 417.4173811919.

The spelling of 72729665 in words is "seventy-two million, seven hundred twenty-nine thousand, six hundred sixty-five".