90641863 has 4 divisors (see below), whose sum is σ = 97614328. Its totient is φ = 83669400.

The previous prime is 90641839. The next prime is 90641869. The reversal of 90641863 is 36814609.

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

It is a cyclic number.

It is not a de Polignac number, because 90641863 - 2⁹ = 90641351 is a prime.

It is a super-2 number, since 2×90641863² = 16431894656221538, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90641869) 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, 3486213 + ... + 3486238.

It is an arithmetic number, because the mean of its divisors is an integer number (24403582).

Almost surely, 2^90641863 is an apocalyptic number.

90641863 is a deficient number, since it is larger than the sum of its proper divisors (6972465).

90641863 is a wasteful number, since it uses less digits than its factorization.

90641863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6972464.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 90641863 is about 9520.6020292837. The cubic root of 90641863 is about 449.2033030874.

The spelling of 90641863 in words is "ninety million, six hundred forty-one thousand, eight hundred sixty-three".