72177091 has 16 divisors (see below), whose sum is σ = 85811968. Its totient is φ = 59421600.

The previous prime is 72177089. The next prime is 72177107. The reversal of 72177091 is 19077127.

It is not a de Polignac number, because 72177091 - 2¹ = 72177089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72177691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16396 + ... + 20326.

It is an arithmetic number, because the mean of its divisors is an integer number (5363248).

Almost surely, 2^72177091 is an apocalyptic number.

72177091 is a deficient number, since it is larger than the sum of its proper divisors (13634877).

72177091 is a wasteful number, since it uses less digits than its factorization.

72177091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4042.

The product of its (nonzero) digits is 6174, while the sum is 34.

The square root of 72177091 is about 8495.7101527771. The cubic root of 72177091 is about 416.3575632467.

The spelling of 72177091 in words is "seventy-two million, one hundred seventy-seven thousand, ninety-one".