81484890 has 16 divisors (see below), whose sum is σ = 195563808. Its totient is φ = 21729296.

The previous prime is 81484889. The next prime is 81484919. The reversal of 81484890 is 9848418.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1358052 + ... + 1358111.

It is an arithmetic number, because the mean of its divisors is an integer number (12222738).

Almost surely, 2^81484890 is an apocalyptic number.

81484890 is an abundant number, since it is smaller than the sum of its proper divisors (114078918).

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

81484890 is a wasteful number, since it uses less digits than its factorization.

81484890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2716173.

The product of its (nonzero) digits is 73728, while the sum is 42.

The square root of 81484890 is about 9026.8981383419. The cubic root of 81484890 is about 433.5365273223.

The spelling of 81484890 in words is "eighty-one million, four hundred eighty-four thousand, eight hundred ninety".