81556696 has 48 divisors (see below), whose sum is σ = 167005800. Its totient is φ = 37320192.

The previous prime is 81556693. The next prime is 81556697. The reversal of 81556696 is 69665518.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81556693) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 241840 + ... + 242176.

Almost surely, 2^81556696 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 81556696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83502900).

81556696 is an abundant number, since it is smaller than the sum of its proper divisors (85449104).

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

81556696 is a wasteful number, since it uses less digits than its factorization.

81556696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 548 (or 531 counting only the distinct ones).

The product of its digits is 388800, while the sum is 46.

The square root of 81556696 is about 9030.8745977342. The cubic root of 81556696 is about 433.6638367498.

The spelling of 81556696 in words is "eighty-one million, five hundred fifty-six thousand, six hundred ninety-six".