81827358 has 32 divisors (see below), whose sum is σ = 175737600. Its totient is φ = 25307520.

The previous prime is 81827351. The next prime is 81827359. The reversal of 81827358 is 85372818.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81827351) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1593 + ... + 12891.

It is an arithmetic number, because the mean of its divisors is an integer number (5491800).

Almost surely, 2^81827358 is an apocalyptic number.

81827358 is an abundant number, since it is smaller than the sum of its proper divisors (93910242).

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

81827358 is a wasteful number, since it uses less digits than its factorization.

81827358 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11392.

The product of its digits is 107520, while the sum is 42.

The square root of 81827358 is about 9045.8475556467. The cubic root of 81827358 is about 434.1430400546.

The spelling of 81827358 in words is "eighty-one million, eight hundred twenty-seven thousand, three hundred fifty-eight".