81400158 has 48 divisors (see below), whose sum is σ = 208522080. Its totient is φ = 22454208.

The previous prime is 81400093. The next prime is 81400171. The reversal of 81400158 is 85100418.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7485 + ... + 14792.

It is an arithmetic number, because the mean of its divisors is an integer number (4344210).

Almost surely, 2^81400158 is an apocalyptic number.

81400158 is an abundant number, since it is smaller than the sum of its proper divisors (127121922).

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

81400158 is a wasteful number, since it uses less digits than its factorization.

81400158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22321 (or 22318 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 27.

The square root of 81400158 is about 9022.2036110919. The cubic root of 81400158 is about 433.3862043313.

The spelling of 81400158 in words is "eighty-one million, four hundred thousand, one hundred fifty-eight".