81155024 has 40 divisors (see below), whose sum is σ = 163680000. Its totient is φ = 38937600.

The previous prime is 81155003. The next prime is 81155033. The reversal of 81155024 is 42055118.

It is a super-2 number, since 2×81155024² = 13172275840881152, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81154984 and 81155002.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64352 + ... + 65600.

It is an arithmetic number, because the mean of its divisors is an integer number (4092000).

Almost surely, 2^81155024 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 81155024, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81840000).

81155024 is an abundant number, since it is smaller than the sum of its proper divisors (82524976).

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

81155024 is a wasteful number, since it uses less digits than its factorization.

81155024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1419 (or 1413 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 26.

The square root of 81155024 is about 9008.6083275942. The cubic root of 81155024 is about 432.9507239464.

The spelling of 81155024 in words is "eighty-one million, one hundred fifty-five thousand, twenty-four".