86619649 has 4 divisors (see below), whose sum is σ = 88254036. Its totient is φ = 84985264.

The previous prime is 86619647. The next prime is 86619661. The reversal of 86619649 is 94691668.

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 49956624 + 36663025 = 7068^2 + 6055^2 .

It is a cyclic number.

It is not a de Polignac number, because 86619649 - 2¹ = 86619647 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (86619647) 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 3 ways as a sum of consecutive naturals, for example, 817114 + ... + 817219.

It is an arithmetic number, because the mean of its divisors is an integer number (22063509).

Almost surely, 2^86619649 is an apocalyptic number.

It is an amenable number.

86619649 is a deficient number, since it is larger than the sum of its proper divisors (1634387).

86619649 is a wasteful number, since it uses less digits than its factorization.

86619649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1634386.

The product of its digits is 559872, while the sum is 49.

The square root of 86619649 is about 9306.9677661417. The cubic root of 86619649 is about 442.4580895968.

The spelling of 86619649 in words is "eighty-six million, six hundred nineteen thousand, six hundred forty-nine".