81358146 has 24 divisors (see below), whose sum is σ = 176701824. Its totient is φ = 27053880.

The previous prime is 81358129. The next prime is 81358157. The reversal of 81358146 is 64185318.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 81358146.

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 11 ways as a sum of consecutive naturals, for example, 2515 + ... + 13001.

It is an arithmetic number, because the mean of its divisors is an integer number (7362576).

Almost surely, 2^81358146 is an apocalyptic number.

81358146 is an abundant number, since it is smaller than the sum of its proper divisors (95343678).

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

81358146 is a wasteful number, since it uses less digits than its factorization.

81358146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10926 (or 10923 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 81358146 is about 9019.8750545670. The cubic root of 81358146 is about 433.3116321808.

The spelling of 81358146 in words is "eighty-one million, three hundred fifty-eight thousand, one hundred forty-six".