81379496 has 32 divisors (see below), whose sum is σ = 167680800. Its totient is φ = 36719040.

The previous prime is 81379483. The next prime is 81379511. The reversal of 81379496 is 69497318.

It is a self number, because there is not a number n which added to its sum of digits gives 81379496.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8906 + ... + 15558.

It is an arithmetic number, because the mean of its divisors is an integer number (5240025).

Almost surely, 2^81379496 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 81379496, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83840400).

81379496 is an abundant number, since it is smaller than the sum of its proper divisors (86301304).

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

81379496 is a wasteful number, since it uses less digits than its factorization.

81379496 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6809 (or 6805 counting only the distinct ones).

The product of its digits is 326592, while the sum is 47.

The square root of 81379496 is about 9021.0584744807. The cubic root of 81379496 is about 433.3495320703.

The spelling of 81379496 in words is "eighty-one million, three hundred seventy-nine thousand, four hundred ninety-six".