86928889477 has 4 divisors (see below), whose sum is σ = 89926437420. Its totient is φ = 83931341536.

The previous prime is 86928889451. The next prime is 86928889493. The reversal of 86928889477 is 77498882968.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 42666620481 + 44262268996 = 206559^2 + 210386^2 .

It is a cyclic number.

It is not a de Polignac number, because 86928889477 - 2²³ = 86920500869 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 (86928889447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1498773928 + ... + 1498773985.

It is an arithmetic number, because the mean of its divisors is an integer number (22481609355).

Almost surely, 2^86928889477 is an apocalyptic number.

It is an amenable number.

86928889477 is a deficient number, since it is larger than the sum of its proper divisors (2997547943).

86928889477 is a wasteful number, since it uses less digits than its factorization.

86928889477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2997547942.

The product of its digits is 780337152, while the sum is 76.

The spelling of 86928889477 in words is "eighty-six billion, nine hundred twenty-eight million, eight hundred eighty-nine thousand, four hundred seventy-seven".