72644169 has 32 divisors (see below), whose sum is σ = 107872128. Its totient is φ = 43200000.

The previous prime is 72644167. The next prime is 72644183. The reversal of 72644169 is 96144627.

It is a happy number.

It is not a de Polignac number, because 72644169 - 2¹ = 72644167 is a prime.

It is a super-2 number, since 2×72644169² = 10554350579401122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (72644161) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 289294 + ... + 289544.

It is an arithmetic number, because the mean of its divisors is an integer number (3371004).

Almost surely, 2^72644169 is an apocalyptic number.

It is an amenable number.

72644169 is a deficient number, since it is larger than the sum of its proper divisors (35227959).

72644169 is a wasteful number, since it uses less digits than its factorization.

72644169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489.

The product of its digits is 72576, while the sum is 39.

The square root of 72644169 is about 8523.1548736369. The cubic root of 72644169 is about 417.2537546557.

The spelling of 72644169 in words is "seventy-two million, six hundred forty-four thousand, one hundred sixty-nine".