81045936 has 60 divisors (see below), whose sum is σ = 240165432. Its totient is φ = 25425408.

The previous prime is 81045929. The next prime is 81045941. The reversal of 81045936 is 63954018.

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 Harshad number since it is a multiple of its sum of digits (36).

It is a nialpdrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 81045936.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14106 + ... + 19001.

Almost surely, 2^81045936 is an apocalyptic number.

It is an amenable number.

81045936 is an abundant number, since it is smaller than the sum of its proper divisors (159119496).

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

81045936 is a wasteful number, since it uses less digits than its factorization.

81045936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33138 (or 33129 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 81045936 is about 9002.5516382857. The cubic root of 81045936 is about 432.7566472111.

The spelling of 81045936 in words is "eighty-one million, forty-five thousand, nine hundred thirty-six".