86649891 has 8 divisors (see below), whose sum is σ = 117160704. Its totient is φ = 56952840.

The previous prime is 86649889. The next prime is 86649917. The reversal of 86649891 is 19894668.

It is a happy number.

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

It is not a de Polignac number, because 86649891 - 2¹ = 86649889 is a prime.

It is a super-2 number, since 2×86649891² = 15016407220623762, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (86649841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 203191 + ... + 203616.

It is an arithmetic number, because the mean of its divisors is an integer number (14645088).

Almost surely, 2^86649891 is an apocalyptic number.

86649891 is a deficient number, since it is larger than the sum of its proper divisors (30510813).

86649891 is a wasteful number, since it uses less digits than its factorization.

86649891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406881.

The product of its digits is 746496, while the sum is 51.

The square root of 86649891 is about 9308.5923210763. The cubic root of 86649891 is about 442.5095762235.

The spelling of 86649891 in words is "eighty-six million, six hundred forty-nine thousand, eight hundred ninety-one".