81016152 has 128 divisors (see below), whose sum is σ = 258163200. Its totient is φ = 20625408.

The previous prime is 81016147. The next prime is 81016211. The reversal of 81016152 is 25161018.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53518 + ... + 55010.

It is an arithmetic number, because the mean of its divisors is an integer number (2016900).

Almost surely, 2^81016152 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 81016152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (129081600).

81016152 is an abundant number, since it is smaller than the sum of its proper divisors (177147048).

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

81016152 is a wasteful number, since it uses less digits than its factorization.

81016152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1545 (or 1541 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 24.

The square root of 81016152 is about 9000.8972886041. The cubic root of 81016152 is about 432.7036287056.

The spelling of 81016152 in words is "eighty-one million, sixteen thousand, one hundred fifty-two".