72442989 has 6 divisors (see below), whose sum is σ = 104639886. Its totient is φ = 48295320.

The previous prime is 72442987. The next prime is 72443009. The reversal of 72442989 is 98924427.

It can be written as a sum of positive squares in only one way, i.e., 51236964 + 21206025 = 7158^2 + 4605^2 .

It is not a de Polignac number, because 72442989 - 2¹ = 72442987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72442987) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4024602 + ... + 4024619.

It is an arithmetic number, because the mean of its divisors is an integer number (17439981).

Almost surely, 2^72442989 is an apocalyptic number.

It is an amenable number.

72442989 is a deficient number, since it is larger than the sum of its proper divisors (32196897).

72442989 is a wasteful number, since it uses less digits than its factorization.

72442989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8049227 (or 8049224 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 72442989 is about 8511.3447233677. The cubic root of 72442989 is about 416.8682191459.

The spelling of 72442989 in words is "seventy-two million, four hundred forty-two thousand, nine hundred eighty-nine".