81896277 has 4 divisors (see below), whose sum is σ = 109195040. Its totient is φ = 54597516.

The previous prime is 81896273. The next prime is 81896317. The reversal of 81896277 is 77269818.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 81896277 - 2² = 81896273 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81896273) 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 3 ways as a sum of consecutive naturals, for example, 13649377 + ... + 13649382.

It is an arithmetic number, because the mean of its divisors is an integer number (27298760).

Almost surely, 2^81896277 is an apocalyptic number.

It is an amenable number.

81896277 is a deficient number, since it is larger than the sum of its proper divisors (27298763).

81896277 is a wasteful number, since it uses less digits than its factorization.

81896277 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27298762.

The product of its digits is 338688, while the sum is 48.

The square root of 81896277 is about 9049.6561813143. The cubic root of 81896277 is about 434.2648913466.

The spelling of 81896277 in words is "eighty-one million, eight hundred ninety-six thousand, two hundred seventy-seven".