81277010 has 16 divisors (see below), whose sum is σ = 148698072. Its totient is φ = 31977600.

The previous prime is 81276977. The next prime is 81277013. The reversal of 81277010 is 1077218.

It can be written as a sum of positive squares in 4 ways, for example, as 69872881 + 11404129 = 8359^2 + 3377^2 .

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 7 ways as a sum of consecutive naturals, for example, 66011 + ... + 67230.

Almost surely, 2^81277010 is an apocalyptic number.

81277010 is a deficient number, since it is larger than the sum of its proper divisors (67421062).

81277010 is a wasteful number, since it uses less digits than its factorization.

81277010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133309.

The product of its (nonzero) digits is 784, while the sum is 26.

The square root of 81277010 is about 9015.3763093950. The cubic root of 81277010 is about 433.1675414419.

The spelling of 81277010 in words is "eighty-one million, two hundred seventy-seven thousand, ten".