81488554 has 8 divisors (see below), whose sum is σ = 139694688. Its totient is φ = 34923660.

The previous prime is 81488551. The next prime is 81488557. The reversal of 81488554 is 45588418.

It is an interprime number because it is at equal distance from previous prime (81488551) and next prime (81488557).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 81488554.

It is not an unprimeable number, because it can be changed into a prime (81488551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2910292 + ... + 2910319.

It is an arithmetic number, because the mean of its divisors is an integer number (17461836).

Almost surely, 2^81488554 is an apocalyptic number.

81488554 is a deficient number, since it is larger than the sum of its proper divisors (58206134).

81488554 is a wasteful number, since it uses less digits than its factorization.

81488554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5820620.

The product of its digits is 204800, while the sum is 43.

The square root of 81488554 is about 9027.1010850660. The cubic root of 81488554 is about 433.5430252715.

The spelling of 81488554 in words is "eighty-one million, four hundred eighty-eight thousand, five hundred fifty-four".