81489562 has 16 divisors (see below), whose sum is σ = 152396352. Its totient is φ = 31749120.

The previous prime is 81489547. The next prime is 81489563. The reversal of 81489562 is 26598418.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (81489563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 264423 + ... + 264730.

It is an arithmetic number, because the mean of its divisors is an integer number (9524772).

Almost surely, 2^81489562 is an apocalyptic number.

81489562 is a deficient number, since it is larger than the sum of its proper divisors (70906790).

81489562 is a wasteful number, since it uses less digits than its factorization.

81489562 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 529173.

The product of its digits is 138240, while the sum is 43.

The square root of 81489562 is about 9027.1569167706. The cubic root of 81489562 is about 433.5448128827.

The spelling of 81489562 in words is "eighty-one million, four hundred eighty-nine thousand, five hundred sixty-two".