81490354 has 48 divisors (see below), whose sum is σ = 145555200. Its totient is φ = 34071840.

The previous prime is 81490349. The next prime is 81490369. The reversal of 81490354 is 45309418.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 169887 + ... + 170365.

It is an arithmetic number, because the mean of its divisors is an integer number (3032400).

Almost surely, 2^81490354 is an apocalyptic number.

81490354 is a deficient number, since it is larger than the sum of its proper divisors (64064846).

81490354 is a wasteful number, since it uses less digits than its factorization.

81490354 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 559 (or 548 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 81490354 is about 9027.2007842963. The cubic root of 81490354 is about 433.5462174241.

The spelling of 81490354 in words is "eighty-one million, four hundred ninety thousand, three hundred fifty-four".