81146364 has 36 divisors (see below), whose sum is σ = 205031736. Its totient is φ = 24967488.

The previous prime is 81146363. The next prime is 81146381. The reversal of 81146364 is 46364118.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81146363) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17979 + ... + 22034.

It is an arithmetic number, because the mean of its divisors is an integer number (5695326).

Almost surely, 2^81146364 is an apocalyptic number.

It is an amenable number.

81146364 is an abundant number, since it is smaller than the sum of its proper divisors (123885372).

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

81146364 is a wasteful number, since it uses less digits than its factorization.

81146364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40046 (or 40031 counting only the distinct ones).

The product of its digits is 13824, while the sum is 33.

The square root of 81146364 is about 9008.1276633938. The cubic root of 81146364 is about 432.9353234349.

The spelling of 81146364 in words is "eighty-one million, one hundred forty-six thousand, three hundred sixty-four".