72847989 has 12 divisors (see below), whose sum is σ = 105303276. Its totient is φ = 48529152.

The previous prime is 72847937. The next prime is 72847991. The reversal of 72847989 is 98974827.

It can be written as a sum of positive squares in 2 ways, for example, as 61355889 + 11492100 = 7833^2 + 3390^2 .

It is not a de Polignac number, because 72847989 - 2¹³ = 72839797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72847909) 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, 16147 + ... + 20159.

It is an arithmetic number, because the mean of its divisors is an integer number (8775273).

Almost surely, 2^72847989 is an apocalyptic number.

It is an amenable number.

72847989 is a deficient number, since it is larger than the sum of its proper divisors (32455287).

72847989 is a wasteful number, since it uses less digits than its factorization.

72847989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6036 (or 6033 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 54.

The square root of 72847989 is about 8535.1033385660. The cubic root of 72847989 is about 417.6436241970.

The spelling of 72847989 in words is "seventy-two million, eight hundred forty-seven thousand, nine hundred eighty-nine".