81273388 has 24 divisors (see below), whose sum is σ = 162745632. Its totient is φ = 34788864.

The previous prime is 81273377. The next prime is 81273403. The reversal of 81273388 is 88337218.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 81273388.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34620 + ... + 36892.

It is an arithmetic number, because the mean of its divisors is an integer number (6781068).

Almost surely, 2^81273388 is an apocalyptic number.

It is an amenable number.

81273388 is an abundant number, since it is smaller than the sum of its proper divisors (81472244).

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

81273388 is a wasteful number, since it uses less digits than its factorization.

81273388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3561 (or 3559 counting only the distinct ones).

The product of its digits is 64512, while the sum is 40.

The square root of 81273388 is about 9015.1754281323. The cubic root of 81273388 is about 433.1611068378.

The spelling of 81273388 in words is "eighty-one million, two hundred seventy-three thousand, three hundred eighty-eight".