81282152 has 64 divisors (see below), whose sum is σ = 185856000. Its totient is φ = 32550336.

The previous prime is 81282127. The next prime is 81282163. The reversal of 81282152 is 25128218.

It is a happy number.

It is a super-2 number, since 2×81282152² = 13213576467502208, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83573 + ... + 84539.

It is an arithmetic number, because the mean of its divisors is an integer number (2904000).

Almost surely, 2^81282152 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 81282152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92928000).

81282152 is an abundant number, since it is smaller than the sum of its proper divisors (104573848).

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

81282152 is a wasteful number, since it uses less digits than its factorization.

81282152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1078 (or 1074 counting only the distinct ones).

The product of its digits is 2560, while the sum is 29.

The square root of 81282152 is about 9015.6614843283. The cubic root of 81282152 is about 433.1766760485.

The spelling of 81282152 in words is "eighty-one million, two hundred eighty-two thousand, one hundred fifty-two".