72644022 has 24 divisors (see below), whose sum is σ = 171704520. Its totient is φ = 22013280.

The previous prime is 72644017. The next prime is 72644023. The reversal of 72644022 is 22044627.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72644023) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 183247 + ... + 183642.

It is an arithmetic number, because the mean of its divisors is an integer number (7154355).

Almost surely, 2^72644022 is an apocalyptic number.

72644022 is an abundant number, since it is smaller than the sum of its proper divisors (99060498).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72644022 is a wasteful number, since it uses less digits than its factorization.

72644022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366908 (or 366905 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 27.

The square root of 72644022 is about 8523.1462500652. The cubic root of 72644022 is about 417.2534732092.

Adding to 72644022 its reverse (22044627), we get a palindrome (94688649).

The spelling of 72644022 in words is "seventy-two million, six hundred forty-four thousand, twenty-two".