81270766 has 8 divisors (see below), whose sum is σ = 121978224. Its totient is φ = 40611360.

The previous prime is 81270757. The next prime is 81270769. The reversal of 81270766 is 66707218.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81270769) 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, 7435 + ... + 14758.

It is an arithmetic number, because the mean of its divisors is an integer number (15247278).

Almost surely, 2^81270766 is an apocalyptic number.

81270766 is a deficient number, since it is larger than the sum of its proper divisors (40707458).

81270766 is a wasteful number, since it uses less digits than its factorization.

81270766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24026.

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 81270766 is about 9015.0300054964. The cubic root of 81270766 is about 433.1564486479.

The spelling of 81270766 in words is "eighty-one million, two hundred seventy thousand, seven hundred sixty-six".