81276870 has 32 divisors (see below), whose sum is σ = 205332480. Its totient is φ = 20532960.

The previous prime is 81276869. The next prime is 81276893. The reversal of 81276870 is 7867218.

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, 70726 + ... + 71865.

It is an arithmetic number, because the mean of its divisors is an integer number (6416640).

Almost surely, 2^81276870 is an apocalyptic number.

81276870 is an abundant number, since it is smaller than the sum of its proper divisors (124055610).

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

81276870 is a wasteful number, since it uses less digits than its factorization.

81276870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142620.

The product of its (nonzero) digits is 37632, while the sum is 39.

The square root of 81276870 is about 9015.3685448793. The cubic root of 81276870 is about 433.1672927308.

The spelling of 81276870 in words is "eighty-one million, two hundred seventy-six thousand, eight hundred seventy".