86021578 has 4 divisors (see below), whose sum is σ = 129032370. Its totient is φ = 43010788.

The previous prime is 86021561. The next prime is 86021623. The reversal of 86021578 is 87512068.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 72131049 + 13890529 = 8493^2 + 3727^2 .

It is a super-2 number, since 2×86021578² = 14799423763220168, which contains 22 as substring.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 21505393 + ... + 21505396.

Almost surely, 2^86021578 is an apocalyptic number.

86021578 is a deficient number, since it is larger than the sum of its proper divisors (43010792).

86021578 is a wasteful number, since it uses less digits than its factorization.

86021578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43010791.

The product of its (nonzero) digits is 26880, while the sum is 37.

The square root of 86021578 is about 9274.7818303182. The cubic root of 86021578 is about 441.4374099784.

The spelling of 86021578 in words is "eighty-six million, twenty-one thousand, five hundred seventy-eight".