72644229 has 32 divisors (see below), whose sum is σ = 125031680. Its totient is φ = 40824000.

The previous prime is 72644227. The next prime is 72644233. The reversal of 72644229 is 92244627.

72644229 is a `hidden beast` number, since 7 + 2 + 644 + 2 + 2 + 9 = 666.

It is not a de Polignac number, because 72644229 - 2¹ = 72644227 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72644193 and 72644202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72644227) 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, 8379 + ... + 14679.

It is an arithmetic number, because the mean of its divisors is an integer number (3907240).

Almost surely, 2^72644229 is an apocalyptic number.

It is an amenable number.

72644229 is a deficient number, since it is larger than the sum of its proper divisors (52387451).

72644229 is a wasteful number, since it uses less digits than its factorization.

72644229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6378 (or 6372 counting only the distinct ones).

The product of its digits is 48384, while the sum is 36.

The square root of 72644229 is about 8523.1583934596. The cubic root of 72644229 is about 417.2538695317.

The spelling of 72644229 in words is "seventy-two million, six hundred forty-four thousand, two hundred twenty-nine".