81390096 has 50 divisors (see below), whose sum is σ = 235570302. Its totient is φ = 27129600.

The previous prime is 81390083. The next prime is 81390103. The reversal of 81390096 is 69009318.

It can be written as a sum of positive squares in only one way, i.e., 51840000 + 29550096 = 7200^2 + 5436^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 81390096.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 30105 + ... + 32696.

Almost surely, 2^81390096 is an apocalyptic number.

It is an amenable number.

81390096 is an abundant number, since it is smaller than the sum of its proper divisors (154180206).

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

81390096 is a wasteful number, since it uses less digits than its factorization.

81390096 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62821 (or 62806 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 81390096 is about 9021.6459695557. The cubic root of 81390096 is about 433.3683464148.

It can be divided in two parts, 813 and 90096, that added together give a palindrome (90909).

The spelling of 81390096 in words is "eighty-one million, three hundred ninety thousand, ninety-six".