72644472 has 32 divisors (see below), whose sum is σ = 201790800. Its totient is φ = 24214752.

The previous prime is 72644471. The next prime is 72644477. The reversal of 72644472 is 27444627.

It is a happy number.

72644472 is a `hidden beast` number, since 7 + 2 + 644 + 4 + 7 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72644471) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 167943 + ... + 168374.

Almost surely, 2^72644472 is an apocalyptic number.

72644472 is a gapful number since it is divisible by the number (72) formed by its first and last digit.

It is an amenable number.

72644472 is an abundant number, since it is smaller than the sum of its proper divisors (129146328).

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

72644472 is a wasteful number, since it uses less digits than its factorization.

72644472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336332 (or 336322 counting only the distinct ones).

The product of its digits is 75264, while the sum is 36.

The square root of 72644472 is about 8523.1726487265. The cubic root of 72644472 is about 417.2543347790.

The spelling of 72644472 in words is "seventy-two million, six hundred forty-four thousand, four hundred seventy-two".