73889981 has 6 divisors (see below), whose sum is σ = 81218046. Its totient is φ = 67172600.

The previous prime is 73889929. The next prime is 73889983. The reversal of 73889981 is 18998837.

It can be written as a sum of positive squares in only one way, i.e., 60310756 + 13579225 = 7766^2 + 3685^2 .

It is not a de Polignac number, because 73889981 - 2¹⁸ = 73627837 is a prime.

It is a super-2 number, since 2×73889981² = 10919458584360722, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73889983) 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, 305210 + ... + 305451.

It is an arithmetic number, because the mean of its divisors is an integer number (13536341).

Almost surely, 2^73889981 is an apocalyptic number.

It is an amenable number.

73889981 is a deficient number, since it is larger than the sum of its proper divisors (7328065).

73889981 is a wasteful number, since it uses less digits than its factorization.

73889981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610683 (or 610672 counting only the distinct ones).

The product of its digits is 870912, while the sum is 53.

The square root of 73889981 is about 8595.9281639623. The cubic root of 73889981 is about 419.6254805723.

The spelling of 73889981 in words is "seventy-three million, eight hundred eighty-nine thousand, nine hundred eighty-one".