81073560 has 64 divisors (see below), whose sum is σ = 251618400. Its totient is φ = 20873216.

The previous prime is 81073547. The next prime is 81073607. The reversal of 81073560 is 6537018.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8169 + ... + 15128.

Almost surely, 2^81073560 is an apocalyptic number.

It is an amenable number.

81073560 is an abundant number, since it is smaller than the sum of its proper divisors (170544840).

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

81073560 is a wasteful number, since it uses less digits than its factorization.

81073560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23340 (or 23336 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 81073560 is about 9004.0857392630. The cubic root of 81073560 is about 432.8058090908.

The spelling of 81073560 in words is "eighty-one million, seventy-three thousand, five hundred sixty".