86561998 has 8 divisors (see below), whose sum is σ = 129890160. Its totient is φ = 43265280.

The previous prime is 86561971. The next prime is 86561999. The reversal of 86561998 is 89916568.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86561999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1038 + ... + 13198.

It is an arithmetic number, because the mean of its divisors is an integer number (16236270).

Almost surely, 2^86561998 is an apocalyptic number.

86561998 is a deficient number, since it is larger than the sum of its proper divisors (43328162).

86561998 is a wasteful number, since it uses less digits than its factorization.

86561998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15722.

The product of its digits is 933120, while the sum is 52.

The square root of 86561998 is about 9303.8700549825. The cubic root of 86561998 is about 442.3599062830.

The spelling of 86561998 in words is "eighty-six million, five hundred sixty-one thousand, nine hundred ninety-eight".