81032562 has 80 divisors (see below), whose sum is σ = 197893080. Its totient is φ = 24634368.

The previous prime is 81032561. The next prime is 81032599. The reversal of 81032562 is 26523018.

It can be written as a sum of positive squares in 4 ways, for example, as 60047001 + 20985561 = 7749^2 + 4581^2 .

It is a super-2 number, since 2×81032562² = 13132552208567688, which contains 22 as substring.

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 (81032561) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 229378 + ... + 229730.

Almost surely, 2^81032562 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81032562, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98946540).

81032562 is an abundant number, since it is smaller than the sum of its proper divisors (116860518).

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

81032562 is a wasteful number, since it uses less digits than its factorization.

81032562 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489 (or 480 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 81032562 is about 9001.8088182320. The cubic root of 81032562 is about 432.7328417576.

The spelling of 81032562 in words is "eighty-one million, thirty-two thousand, five hundred sixty-two".