81077152 has 48 divisors (see below), whose sum is σ = 177472512. Its totient is φ = 36207360.

The previous prime is 81077149. The next prime is 81077153. The reversal of 81077152 is 25177018.

It is a happy number.

It is a super-2 number, since 2×81077152² = 13147009152862208, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is not an unprimeable number, because it can be changed into a prime (81077153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9753 + ... + 16039.

It is an arithmetic number, because the mean of its divisors is an integer number (3697344).

Almost surely, 2^81077152 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 81077152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88736256).

81077152 is an abundant number, since it is smaller than the sum of its proper divisors (96395360).

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

81077152 is a wasteful number, since it uses less digits than its factorization.

81077152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6341 (or 6333 counting only the distinct ones).

The product of its (nonzero) digits is 3920, while the sum is 31.

The square root of 81077152 is about 9004.2852020580. The cubic root of 81077152 is about 432.8122008808.

The spelling of 81077152 in words is "eighty-one million, seventy-seven thousand, one hundred fifty-two".