81457999490 has 64 divisors (see below), whose sum is σ = 169340371200. Its totient is φ = 27634763520.

The previous prime is 81457999463. The next prime is 81457999529. The reversal of 81457999490 is 9499975418.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3187604 + ... + 3213056.

It is an arithmetic number, because the mean of its divisors is an integer number (2645943300).

Almost surely, 2^81457999490 is an apocalyptic number.

81457999490 is an abundant number, since it is smaller than the sum of its proper divisors (87882371710).

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

81457999490 is a wasteful number, since it uses less digits than its factorization.

81457999490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25947.

The product of its (nonzero) digits is 29393280, while the sum is 65.

The spelling of 81457999490 in words is "eighty-one billion, four hundred fifty-seven million, nine hundred ninety-nine thousand, four hundred ninety".