90689843 has 4 divisors (see below), whose sum is σ = 91708920. Its totient is φ = 89670768.

The previous prime is 90689839. The next prime is 90689857. The reversal of 90689843 is 34898609.

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 90689843 - 2² = 90689839 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90689803) 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, 509405 + ... + 509582.

It is an arithmetic number, because the mean of its divisors is an integer number (22927230).

Almost surely, 2^90689843 is an apocalyptic number.

90689843 is a deficient number, since it is larger than the sum of its proper divisors (1019077).

90689843 is a wasteful number, since it uses less digits than its factorization.

90689843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1019076.

The product of its (nonzero) digits is 373248, while the sum is 47.

The square root of 90689843 is about 9523.1214945521. The cubic root of 90689843 is about 449.2825489311.

The spelling of 90689843 in words is "ninety million, six hundred eighty-nine thousand, eight hundred forty-three".