81692496 has 80 divisors (see below), whose sum is σ = 236492800. Its totient is φ = 26998272.

The previous prime is 81692491. The next prime is 81692509. The reversal of 81692496 is 69429618.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81692491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54120 + ... + 55608.

It is an arithmetic number, because the mean of its divisors is an integer number (2956160).

Almost surely, 2^81692496 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81692496, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (118246400).

81692496 is an abundant number, since it is smaller than the sum of its proper divisors (154800304).

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

81692496 is a wasteful number, since it uses less digits than its factorization.

81692496 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1633 (or 1621 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 81692496 is about 9038.3901221401. The cubic root of 81692496 is about 433.9044010662.

The spelling of 81692496 in words is "eighty-one million, six hundred ninety-two thousand, four hundred ninety-six".