81700272 has 80 divisors (see below), whose sum is σ = 235600000. Its totient is φ = 27107136.

The previous prime is 81700271. The next prime is 81700277. The reversal of 81700272 is 27200718.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (81700271) 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, 163479 + ... + 163977.

It is an arithmetic number, because the mean of its divisors is an integer number (2945000).

Almost surely, 2^81700272 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 81700272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (117800000).

81700272 is an abundant number, since it is smaller than the sum of its proper divisors (153899728).

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

81700272 is a wasteful number, since it uses less digits than its factorization.

81700272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 895 (or 883 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 27.

The square root of 81700272 is about 9038.8202770052. The cubic root of 81700272 is about 433.9181678695.

The spelling of 81700272 in words is "eighty-one million, seven hundred thousand, two hundred seventy-two".