90863986 has 4 divisors (see below), whose sum is σ = 136295982. Its totient is φ = 45431992.

The previous prime is 90863959. The next prime is 90863987. The reversal of 90863986 is 68936809.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 68936809 = 37 ⋅1863157.

It can be written as a sum of positive squares in only one way, i.e., 90839961 + 24025 = 9531^2 + 155^2 .

It is not an unprimeable number, because it can be changed into a prime (90863987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22715995 + ... + 22715998.

Almost surely, 2^90863986 is an apocalyptic number.

90863986 is a deficient number, since it is larger than the sum of its proper divisors (45431996).

90863986 is a wasteful number, since it uses less digits than its factorization.

90863986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45431995.

The product of its (nonzero) digits is 559872, while the sum is 49.

The square root of 90863986 is about 9532.2602776047. The cubic root of 90863986 is about 449.5699364457.

The spelling of 90863986 in words is "ninety million, eight hundred sixty-three thousand, nine hundred eighty-six".