81278430 has 32 divisors (see below), whose sum is σ = 195549984. Its totient is φ = 21620736.

The previous prime is 81278423. The next prime is 81278453. The reversal of 81278430 is 3487218.

It is a junction number, because it is equal to n+sod(n) for n = 81278391 and 81278400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9862 + ... + 16118.

It is an arithmetic number, because the mean of its divisors is an integer number (6110937).

Almost surely, 2^81278430 is an apocalyptic number.

81278430 is an abundant number, since it is smaller than the sum of its proper divisors (114271554).

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

81278430 is a wasteful number, since it uses less digits than its factorization.

81278430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6700.

The product of its (nonzero) digits is 10752, while the sum is 33.

The square root of 81278430 is about 9015.4550633898. The cubic root of 81278430 is about 433.1700640672.

The spelling of 81278430 in words is "eighty-one million, two hundred seventy-eight thousand, four hundred thirty".