868662549 has 56 divisors (see below), whose sum is σ = 1427151960. Its totient is φ = 526030848.

The previous prime is 868662547. The next prime is 868662559. The reversal of 868662549 is 945266868.

It is a happy number.

868662549 is a `hidden beast` number, since 8 + 6 + 8 + 6 + 625 + 4 + 9 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 502208100 + 366454449 = 22410^2 + 19143^2 .

It is not a de Polignac number, because 868662549 - 2¹ = 868662547 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 868662495 and 868662504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (868662541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 358189 + ... + 360605.

Almost surely, 2^868662549 is an apocalyptic number.

It is an amenable number.

868662549 is a deficient number, since it is larger than the sum of its proper divisors (558489411).

868662549 is a wasteful number, since it uses less digits than its factorization.

868662549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2481 (or 2466 counting only the distinct ones).

The product of its digits is 4976640, while the sum is 54.

The square root of 868662549 is about 29473.0817696419. The cubic root of 868662549 is about 954.1508305485.

The spelling of 868662549 in words is "eight hundred sixty-eight million, six hundred sixty-two thousand, five hundred forty-nine".