72113989 has 4 divisors (see below), whose sum is σ = 73336320. Its totient is φ = 70891660.

The previous prime is 72113959. The next prime is 72114011. The reversal of 72113989 is 98931127.

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, and also an emirpimes, since its reverse is a distinct semiprime: 98931127 = 521 ⋅189887.

It is a cyclic number.

It is not a de Polignac number, because 72113989 - 2⁷ = 72113861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72113939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 611077 + ... + 611194.

It is an arithmetic number, because the mean of its divisors is an integer number (18334080).

Almost surely, 2^72113989 is an apocalyptic number.

It is an amenable number.

72113989 is a deficient number, since it is larger than the sum of its proper divisors (1222331).

72113989 is a wasteful number, since it uses less digits than its factorization.

72113989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1222330.

The product of its digits is 27216, while the sum is 40.

The square root of 72113989 is about 8491.9955840780. The cubic root of 72113989 is about 416.2361920708.

The spelling of 72113989 in words is "seventy-two million, one hundred thirteen thousand, nine hundred eighty-nine".