90906859 has 4 divisors (see below), whose sum is σ = 93021016. Its totient is φ = 88792704.

The previous prime is 90906853. The next prime is 90906863. The reversal of 90906859 is 95860909.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90906859 is a prime.

It is a super-3 number, since 3×90906859³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90906853) 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, 1057014 + ... + 1057099.

It is an arithmetic number, because the mean of its divisors is an integer number (23255254).

Almost surely, 2^90906859 is an apocalyptic number.

90906859 is a deficient number, since it is larger than the sum of its proper divisors (2114157).

90906859 is a wasteful number, since it uses less digits than its factorization.

90906859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2114156.

The product of its (nonzero) digits is 174960, while the sum is 46.

The square root of 90906859 is about 9534.5088494374. The cubic root of 90906859 is about 449.6406332533.

The spelling of 90906859 in words is "ninety million, nine hundred six thousand, eight hundred fifty-nine".