81277763 has 8 divisors (see below), whose sum is σ = 97777920. Its totient is φ = 65999880.

The previous prime is 81277759. The next prime is 81277787. The reversal of 81277763 is 36777218.

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

It is a cyclic number.

It is not a de Polignac number, because 81277763 - 2² = 81277759 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81277763.

It is not an unprimeable number, because it can be changed into a prime (81277733) 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, 305423 + ... + 305688.

It is an arithmetic number, because the mean of its divisors is an integer number (12222240).

Almost surely, 2^81277763 is an apocalyptic number.

81277763 is a deficient number, since it is larger than the sum of its proper divisors (16500157).

81277763 is a wasteful number, since it uses less digits than its factorization.

81277763 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611137.

The product of its digits is 98784, while the sum is 41.

The square root of 81277763 is about 9015.4180712821. The cubic root of 81277763 is about 433.1688791476.

The spelling of 81277763 in words is "eighty-one million, two hundred seventy-seven thousand, seven hundred sixty-three".