81498944 has 14 divisors (see below), whose sum is σ = 161724594. Its totient is φ = 40749440.

The previous prime is 81498941. The next prime is 81499013. The reversal of 81498944 is 44989418.

It can be written as a sum of positive squares in only one way, i.e., 67897600 + 13601344 = 8240^2 + 3688^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81498941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 636647 + ... + 636774.

Almost surely, 2^81498944 is an apocalyptic number.

It is an amenable number.

81498944 is a deficient number, since it is larger than the sum of its proper divisors (80225650).

81498944 is a wasteful number, since it uses less digits than its factorization.

81498944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1273433 (or 1273423 counting only the distinct ones).

The product of its digits is 331776, while the sum is 47.

The square root of 81498944 is about 9027.6765560137. The cubic root of 81498944 is about 433.5614504383.

The spelling of 81498944 in words is "eighty-one million, four hundred ninety-eight thousand, nine hundred forty-four".