81486120 has 32 divisors (see below), whose sum is σ = 244458720. Its totient is φ = 21729600.

The previous prime is 81486103. The next prime is 81486127. The reversal of 81486120 is 2168418.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (81486127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 339406 + ... + 339645.

It is an arithmetic number, because the mean of its divisors is an integer number (7639335).

Almost surely, 2^81486120 is an apocalyptic number.

It is an amenable number.

81486120 is an abundant number, since it is smaller than the sum of its proper divisors (162972600).

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

81486120 is a wasteful number, since it uses less digits than its factorization.

81486120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 679065 (or 679061 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 30.

The square root of 81486120 is about 9026.9662678001. The cubic root of 81486120 is about 433.5387086970.

The spelling of 81486120 in words is "eighty-one million, four hundred eighty-six thousand, one hundred twenty".