81018952 has 72 divisors (see below), whose sum is σ = 183607830. Its totient is φ = 33398400.

The previous prime is 81018947. The next prime is 81018961. The reversal of 81018952 is 25981018.

It can be written as a sum of positive squares in only one way, i.e., 80030916 + 988036 = 8946^2 + 994^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1141077 + ... + 1141147.

Almost surely, 2^81018952 is an apocalyptic number.

81018952 is a gapful number since it is divisible by the number (82) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81018952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91803915).

81018952 is an abundant number, since it is smaller than the sum of its proper divisors (102588878).

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

81018952 is a wasteful number, since it uses less digits than its factorization.

81018952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203 (or 121 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 34.

The square root of 81018952 is about 9001.0528273086. The cubic root of 81018952 is about 432.7086135396.

The spelling of 81018952 in words is "eighty-one million, eighteen thousand, nine hundred fifty-two".