81553882 has 8 divisors (see below), whose sum is σ = 122386752. Its totient is φ = 40758300.

The previous prime is 81553877. The next prime is 81553907. The reversal of 81553882 is 28835518.

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

It is a super-3 number, since 3×81553882³ (a number of 25 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2994 + ... + 13117.

It is an arithmetic number, because the mean of its divisors is an integer number (15298344).

Almost surely, 2^81553882 is an apocalyptic number.

81553882 is a deficient number, since it is larger than the sum of its proper divisors (40832870).

81553882 is a wasteful number, since it uses less digits than its factorization.

81553882 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18644.

The product of its digits is 76800, while the sum is 40.

The square root of 81553882 is about 9030.7187975266. The cubic root of 81553882 is about 433.6588490372.

The spelling of 81553882 in words is "eighty-one million, five hundred fifty-three thousand, eight hundred eighty-two".