81482280 has 64 divisors (see below), whose sum is σ = 266673600. Its totient is φ = 19752960.

The previous prime is 81482273. The next prime is 81482281. The reversal of 81482280 is 8228418.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (81482281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29545 + ... + 32184.

It is an arithmetic number, because the mean of its divisors is an integer number (4166775).

Almost surely, 2^81482280 is an apocalyptic number.

It is an amenable number.

81482280 is an abundant number, since it is smaller than the sum of its proper divisors (185191320).

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

81482280 is a wasteful number, since it uses less digits than its factorization.

81482280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61754 (or 61750 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 33.

The square root of 81482280 is about 9026.7535692518. The cubic root of 81482280 is about 433.5318984787.

The spelling of 81482280 in words is "eighty-one million, four hundred eighty-two thousand, two hundred eighty".