81295777 has 8 divisors (see below), whose sum is σ = 84923136. Its totient is φ = 77676192.

The previous prime is 81295769. The next prime is 81295783. The reversal of 81295777 is 77759218.

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 81295777 - 2³ = 81295769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81295727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33013 + ... + 35389.

It is an arithmetic number, because the mean of its divisors is an integer number (10615392).

Almost surely, 2^81295777 is an apocalyptic number.

It is an amenable number.

81295777 is a deficient number, since it is larger than the sum of its proper divisors (3627359).

81295777 is a wasteful number, since it uses less digits than its factorization.

81295777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3887.

The product of its digits is 246960, while the sum is 46.

The square root of 81295777 is about 9016.4170821896. The cubic root of 81295777 is about 433.2008785838.

The spelling of 81295777 in words is "eighty-one million, two hundred ninety-five thousand, seven hundred seventy-seven".