72423891 has 12 divisors (see below), whose sum is σ = 105873768. Its totient is φ = 47700384.

The previous prime is 72423889. The next prime is 72423959. The reversal of 72423891 is 19832427.

It is not a de Polignac number, because 72423891 - 2¹ = 72423889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72423821) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 47730 + ... + 49223.

It is an arithmetic number, because the mean of its divisors is an integer number (8822814).

Almost surely, 2^72423891 is an apocalyptic number.

72423891 is a deficient number, since it is larger than the sum of its proper divisors (33449877).

72423891 is a wasteful number, since it uses less digits than its factorization.

72423891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97042 (or 97039 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 72423891 is about 8510.2227350405. Note that the first 3 decimals coincide. The cubic root of 72423891 is about 416.8315832152.

The spelling of 72423891 in words is "seventy-two million, four hundred twenty-three thousand, eight hundred ninety-one".