81278862 has 64 divisors (see below), whose sum is σ = 192497664. Its totient is φ = 22394880.

The previous prime is 81278861. The next prime is 81278867. The reversal of 81278862 is 26887218.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81278861) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 299787 + ... + 300057.

It is an arithmetic number, because the mean of its divisors is an integer number (3007776).

Almost surely, 2^81278862 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81278862, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96248832).

81278862 is an abundant number, since it is smaller than the sum of its proper divisors (111218802).

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

81278862 is a wasteful number, since it uses less digits than its factorization.

81278862 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 513.

The product of its digits is 86016, while the sum is 42.

The square root of 81278862 is about 9015.4790222151. The cubic root of 81278862 is about 433.1708315079.

The spelling of 81278862 in words is "eighty-one million, two hundred seventy-eight thousand, eight hundred sixty-two".