81204255 has 64 divisors (see below), whose sum is σ = 158976000. Its totient is φ = 39000960.

The previous prime is 81204239. The next prime is 81204269. The reversal of 81204255 is 55240218.

It is a happy number.

It is not a de Polignac number, because 81204255 - 2⁴ = 81204239 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 221082 + ... + 221448.

It is an arithmetic number, because the mean of its divisors is an integer number (2484000).

Almost surely, 2^81204255 is an apocalyptic number.

81204255 is a deficient number, since it is larger than the sum of its proper divisors (77771745).

81204255 is a wasteful number, since it uses less digits than its factorization.

81204255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 541 (or 535 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The square root of 81204255 is about 9011.3403553522. The cubic root of 81204255 is about 433.0382530871.

The spelling of 81204255 in words is "eighty-one million, two hundred four thousand, two hundred fifty-five".