86921944 has 8 divisors (see below), whose sum is σ = 162978660. Its totient is φ = 43460968.

The previous prime is 86921851. The next prime is 86921953. The reversal of 86921944 is 44912968.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 86921944.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5432614 + ... + 5432629.

Almost surely, 2^86921944 is an apocalyptic number.

It is an amenable number.

86921944 is a deficient number, since it is larger than the sum of its proper divisors (76056716).

86921944 is a wasteful number, since it uses less digits than its factorization.

86921944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10865249 (or 10865245 counting only the distinct ones).

The product of its digits is 124416, while the sum is 43.

The square root of 86921944 is about 9323.1938733462. The cubic root of 86921944 is about 442.9722053332.

The spelling of 86921944 in words is "eighty-six million, nine hundred twenty-one thousand, nine hundred forty-four".