81045488 has 60 divisors (see below), whose sum is σ = 171726360. Its totient is φ = 36949248.

The previous prime is 81045487. The next prime is 81045499. The reversal of 81045488 is 88454018.

It is a super-2 number, since 2×81045488² = 13136742250316288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81045487) 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, 255506 + ... + 255822.

It is an arithmetic number, because the mean of its divisors is an integer number (2862106).

Almost surely, 2^81045488 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 81045488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85863180).

81045488 is an abundant number, since it is smaller than the sum of its proper divisors (90680872).

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

81045488 is a wasteful number, since it uses less digits than its factorization.

81045488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402 (or 367 counting only the distinct ones).

The product of its (nonzero) digits is 40960, while the sum is 38.

The square root of 81045488 is about 9002.5267564168. The cubic root of 81045488 is about 432.7558498224.

The spelling of 81045488 in words is "eighty-one million, forty-five thousand, four hundred eighty-eight".