72445881 has 4 divisors (see below), whose sum is σ = 96594512. Its totient is φ = 48297252.

The previous prime is 72445873. The next prime is 72445907. The reversal of 72445881 is 18854427.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 72445881 - 2³ = 72445873 is a prime.

It is a super-2 number, since 2×72445881² = 10496811347732322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (72445801) 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, 12074311 + ... + 12074316.

It is an arithmetic number, because the mean of its divisors is an integer number (24148628).

Almost surely, 2^72445881 is an apocalyptic number.

It is an amenable number.

72445881 is a deficient number, since it is larger than the sum of its proper divisors (24148631).

72445881 is a wasteful number, since it uses less digits than its factorization.

72445881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24148630.

The product of its digits is 71680, while the sum is 39.

The square root of 72445881 is about 8511.5146125704. The cubic root of 72445881 is about 416.8737663441.

The spelling of 72445881 in words is "seventy-two million, four hundred forty-five thousand, eight hundred eighty-one".