72438881 has 4 divisors (see below), whose sum is σ = 72474564. Its totient is φ = 72403200.

The previous prime is 72438869. The next prime is 72438901. The reversal of 72438881 is 18883427.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 32547025 + 39891856 = 5705^2 + 6316^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72438881 is a prime.

It is a super-2 number, since 2×72438881² = 10494782961064322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72438281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14600 + ... + 18921.

It is an arithmetic number, because the mean of its divisors is an integer number (18118641).

Almost surely, 2^72438881 is an apocalyptic number.

It is an amenable number.

72438881 is a deficient number, since it is larger than the sum of its proper divisors (35683).

72438881 is a wasteful number, since it uses less digits than its factorization.

72438881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35682.

The product of its digits is 86016, while the sum is 41.

The square root of 72438881 is about 8511.1033949776. The cubic root of 72438881 is about 416.8603392621.

The spelling of 72438881 in words is "seventy-two million, four hundred thirty-eight thousand, eight hundred eighty-one".