81498756 has 12 divisors (see below), whose sum is σ = 190163792. Its totient is φ = 27166248.

The previous prime is 81498751. The next prime is 81498757. The reversal of 81498756 is 65789418.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (81498751) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3395770 + ... + 3395793.

Almost surely, 2^81498756 is an apocalyptic number.

It is an amenable number.

81498756 is an abundant number, since it is smaller than the sum of its proper divisors (108665036).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81498756 is a wasteful number, since it uses less digits than its factorization.

81498756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6791570 (or 6791568 counting only the distinct ones).

The product of its digits is 483840, while the sum is 48.

The square root of 81498756 is about 9027.6661435833. Note that the first 3 decimals coincide. The cubic root of 81498756 is about 433.5611170613.

The spelling of 81498756 in words is "eighty-one million, four hundred ninety-eight thousand, seven hundred fifty-six".