81488358 has 48 divisors (see below), whose sum is σ = 203164416. Its totient is φ = 23122800.

The previous prime is 81488353. The next prime is 81488383. The reversal of 81488358 is 85388418.

It is a super-3 number, since 3×81488358³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81488353) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16885 + ... + 21167.

It is an arithmetic number, because the mean of its divisors is an integer number (4232592).

Almost surely, 2^81488358 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81488358, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101582208).

81488358 is an abundant number, since it is smaller than the sum of its proper divisors (121676058).

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

81488358 is a wasteful number, since it uses less digits than its factorization.

81488358 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4449 (or 4446 counting only the distinct ones).

The product of its digits is 245760, while the sum is 45.

The square root of 81488358 is about 9027.0902288611. The cubic root of 81488358 is about 433.5426776787.

The spelling of 81488358 in words is "eighty-one million, four hundred eighty-eight thousand, three hundred fifty-eight".