72724481 has 16 divisors (see below), whose sum is σ = 77806080. Its totient is φ = 67858560.

The previous prime is 72724471. The next prime is 72724493. The reversal of 72724481 is 18442727.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 72724481 - 2⁶ = 72724417 is a prime.

It is a super-2 number, since 2×72724481² = 10577700273438722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72724451) 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, 118331 + ... + 118943.

It is an arithmetic number, because the mean of its divisors is an integer number (4862880).

Almost surely, 2^72724481 is an apocalyptic number.

It is an amenable number.

72724481 is a deficient number, since it is larger than the sum of its proper divisors (5081599).

72724481 is a wasteful number, since it uses less digits than its factorization.

72724481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 776.

The product of its digits is 25088, while the sum is 35.

The square root of 72724481 is about 8527.8649731337. The cubic root of 72724481 is about 417.4074634455.

The spelling of 72724481 in words is "seventy-two million, seven hundred twenty-four thousand, four hundred eighty-one".