72144405 has 16 divisors (see below), whose sum is σ = 128256960. Its totient is φ = 38476944.

The previous prime is 72144403. The next prime is 72144419. The reversal of 72144405 is 50444127.

72144405 is a `hidden beast` number, since 7 + 214 + 440 + 5 = 666.

It is not a de Polignac number, because 72144405 - 2¹ = 72144403 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72144403) 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, 267067 + ... + 267336.

It is an arithmetic number, because the mean of its divisors is an integer number (8016060).

Almost surely, 2^72144405 is an apocalyptic number.

It is an amenable number.

72144405 is a deficient number, since it is larger than the sum of its proper divisors (56112555).

72144405 is a wasteful number, since it uses less digits than its factorization.

72144405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534417 (or 534411 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 27.

The square root of 72144405 is about 8493.7862582008. The cubic root of 72144405 is about 416.2947034206.

It can be divided in two parts, 7 and 2144405, that added together give a palindrome (2144412).

The spelling of 72144405 in words is "seventy-two million, one hundred forty-four thousand, four hundred five".