73657989 has 6 divisors (see below), whose sum is σ = 106394886. Its totient is φ = 49105320.

The previous prime is 73657981. The next prime is 73657993. The reversal of 73657989 is 98975637.

It can be written as a sum of positive squares in only one way, i.e., 62489025 + 11168964 = 7905^2 + 3342^2 .

It is not a de Polignac number, because 73657989 - 2³ = 73657981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73657981) 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, 4092102 + ... + 4092119.

It is an arithmetic number, because the mean of its divisors is an integer number (17732481).

Almost surely, 2^73657989 is an apocalyptic number.

It is an amenable number.

73657989 is a deficient number, since it is larger than the sum of its proper divisors (32736897).

73657989 is a wasteful number, since it uses less digits than its factorization.

73657989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8184227 (or 8184224 counting only the distinct ones).

The product of its digits is 2857680, while the sum is 54.

The square root of 73657989 is about 8582.4232591967. The cubic root of 73657989 is about 419.1858548202.

The spelling of 73657989 in words is "seventy-three million, six hundred fifty-seven thousand, nine hundred eighty-nine".