81653358 has 16 divisors (see below), whose sum is σ = 170407296. Its totient is φ = 26034360.

The previous prime is 81653323. The next prime is 81653359. The reversal of 81653358 is 85335618.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81653359) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 295708 + ... + 295983.

It is an arithmetic number, because the mean of its divisors is an integer number (10650456).

Almost surely, 2^81653358 is an apocalyptic number.

81653358 is an abundant number, since it is smaller than the sum of its proper divisors (88753938).

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

81653358 is a wasteful number, since it uses less digits than its factorization.

81653358 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 591719.

The product of its digits is 86400, while the sum is 39.

The square root of 81653358 is about 9036.2247648008. The cubic root of 81653358 is about 433.8350970135.

The spelling of 81653358 in words is "eighty-one million, six hundred fifty-three thousand, three hundred fifty-eight".