86817749 has 4 divisors (see below), whose sum is σ = 87095436. Its totient is φ = 86540064.

The previous prime is 86817727. The next prime is 86817779. The reversal of 86817749 is 94771868.

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 36663025 + 50154724 = 6055^2 + 7082^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86817749 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 86817697 and 86817706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86817719) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138374 + ... + 138999.

It is an arithmetic number, because the mean of its divisors is an integer number (21773859).

Almost surely, 2^86817749 is an apocalyptic number.

It is an amenable number.

86817749 is a deficient number, since it is larger than the sum of its proper divisors (277687).

86817749 is a wasteful number, since it uses less digits than its factorization.

86817749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277686.

The product of its digits is 677376, while the sum is 50.

The square root of 86817749 is about 9317.6042521670. The cubic root of 86817749 is about 442.7951348046.

The spelling of 86817749 in words is "eighty-six million, eight hundred seventeen thousand, seven hundred forty-nine".