81277012 has 12 divisors (see below), whose sum is σ = 146079220. Its totient is φ = 39540096.

The previous prime is 81276977. The next prime is 81277013. The reversal of 81277012 is 21077218.

It can be written as a sum of positive squares in 2 ways, for example, as 52504516 + 28772496 = 7246^2 + 5364^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81277013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 274437 + ... + 274732.

Almost surely, 2^81277012 is an apocalyptic number.

It is an amenable number.

81277012 is a deficient number, since it is larger than the sum of its proper divisors (64802208).

81277012 is a wasteful number, since it uses less digits than its factorization.

81277012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549210 (or 549208 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 28.

The square root of 81277012 is about 9015.3764203166. The cubic root of 81277012 is about 433.1675449949.

The spelling of 81277012 in words is "eighty-one million, two hundred seventy-seven thousand, twelve".