81386272870 has 16 divisors (see below), whose sum is σ = 167423190048. Its totient is φ = 27903864960.

The previous prime is 81386272841. The next prime is 81386272901. The reversal of 81386272870 is 7827268318.

It is a congruent number.

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, 581330451 + ... + 581330590.

It is an arithmetic number, because the mean of its divisors is an integer number (10463949378).

Almost surely, 2^81386272870 is an apocalyptic number.

81386272870 is an abundant number, since it is smaller than the sum of its proper divisors (86036917178).

81386272870 is a wasteful number, since it uses less digits than its factorization.

81386272870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1162661055.

The product of its (nonzero) digits is 1806336, while the sum is 52.

The spelling of 81386272870 in words is "eighty-one billion, three hundred eighty-six million, two hundred seventy-two thousand, eight hundred seventy".