72471789 has 24 divisors (see below), whose sum is σ = 115787672. Its totient is φ = 43390080.

The previous prime is 72471779. The next prime is 72471797. The reversal of 72471789 is 98717427.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 32970564 + 39501225 = 5742^2 + 6285^2 .

It is not a de Polignac number, because 72471789 - 2¹⁵ = 72439021 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72471709) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4042 + ... + 12699.

Almost surely, 2^72471789 is an apocalyptic number.

It is an amenable number.

72471789 is a deficient number, since it is larger than the sum of its proper divisors (43315883).

72471789 is a wasteful number, since it uses less digits than its factorization.

72471789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16797 (or 16794 counting only the distinct ones).

The product of its digits is 197568, while the sum is 45.

The square root of 72471789 is about 8513.0364148170. The cubic root of 72471789 is about 416.9234543694.

The spelling of 72471789 in words is "seventy-two million, four hundred seventy-one thousand, seven hundred eighty-nine".