81255460 has 48 divisors (see below), whose sum is σ = 200475072. Its totient is φ = 27273600.

The previous prime is 81255451. The next prime is 81255469. The reversal of 81255460 is 6455218.

It is an interprime number because it is at equal distance from previous prime (81255451) and next prime (81255469).

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (81255469) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11346 + ... + 17065.

It is an arithmetic number, because the mean of its divisors is an integer number (4176564).

Almost surely, 2^81255460 is an apocalyptic number.

It is an amenable number.

81255460 is an abundant number, since it is smaller than the sum of its proper divisors (119219612).

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

81255460 is a wasteful number, since it uses less digits than its factorization.

81255460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28444 (or 28442 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 31.

The square root of 81255460 is about 9014.1810498791. The cubic root of 81255460 is about 433.1292543311.

The spelling of 81255460 in words is "eighty-one million, two hundred fifty-five thousand, four hundred sixty".