86978549 has 8 divisors (see below), whose sum is σ = 99462720. Its totient is φ = 74509056.

The previous prime is 86978539. The next prime is 86978581. The reversal of 86978549 is 94587968.

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

It is a cyclic number.

It is not a de Polignac number, because 86978549 - 2⁴ = 86978533 is a prime.

It is a super-2 number, since 2×86978549² = 15130535972290802, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 86978494 and 86978503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86978509) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16277 + ... + 20949.

It is an arithmetic number, because the mean of its divisors is an integer number (12432840).

Almost surely, 2^86978549 is an apocalyptic number.

It is an amenable number.

86978549 is a deficient number, since it is larger than the sum of its proper divisors (12484171).

86978549 is a wasteful number, since it uses less digits than its factorization.

86978549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7339.

The product of its digits is 4354560, while the sum is 56.

The square root of 86978549 is about 9326.2290879004. The cubic root of 86978549 is about 443.0683413971.

The spelling of 86978549 in words is "eighty-six million, nine hundred seventy-eight thousand, five hundred forty-nine".