81493896 has 64 divisors (see below), whose sum is σ = 227707200. Its totient is φ = 24089600.

The previous prime is 81493891. The next prime is 81493931. The reversal of 81493896 is 69839418.

It is not an unprimeable number, because it can be changed into a prime (81493891) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7060 + ... + 14588.

It is an arithmetic number, because the mean of its divisors is an integer number (3557925).

Almost surely, 2^81493896 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 81493896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113853600).

81493896 is an abundant number, since it is smaller than the sum of its proper divisors (146213304).

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

81493896 is a wasteful number, since it uses less digits than its factorization.

81493896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7590 (or 7586 counting only the distinct ones).

The product of its digits is 373248, while the sum is 48.

The square root of 81493896 is about 9027.3969670110. The cubic root of 81493896 is about 433.5524987338.

The spelling of 81493896 in words is "eighty-one million, four hundred ninety-three thousand, eight hundred ninety-six".