81560196 has 60 divisors (see below), whose sum is σ = 214866960. Its totient is φ = 26976240.

The previous prime is 81560119. The next prime is 81560201. The reversal of 81560196 is 69106518.

81560196 is a `hidden beast` number, since 8 + 1 + 560 + 1 + 96 = 666.

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 81560196.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 44131 + ... + 45941.

It is an arithmetic number, because the mean of its divisors is an integer number (3581116).

Almost surely, 2^81560196 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 81560196, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107433480).

81560196 is an abundant number, since it is smaller than the sum of its proper divisors (133306764).

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

81560196 is a wasteful number, since it uses less digits than its factorization.

81560196 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1966 (or 1955 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 81560196 is about 9031.0683753363. The cubic root of 81560196 is about 433.6700402123.

The spelling of 81560196 in words is "eighty-one million, five hundred sixty thousand, one hundred ninety-six".