90817845 has 16 divisors (see below), whose sum is σ = 145867392. Its totient is φ = 48249920.

The previous prime is 90817843. The next prime is 90817861. The reversal of 90817845 is 54871809.

It is not a de Polignac number, because 90817845 - 2¹ = 90817843 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 90817797 and 90817806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90817841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7566 + ... + 15455.

It is an arithmetic number, because the mean of its divisors is an integer number (9116712).

Almost surely, 2^90817845 is an apocalyptic number.

It is an amenable number.

90817845 is a deficient number, since it is larger than the sum of its proper divisors (55049547).

90817845 is a wasteful number, since it uses less digits than its factorization.

90817845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23292.

The product of its (nonzero) digits is 80640, while the sum is 42.

The square root of 90817845 is about 9529.8397153362. The cubic root of 90817845 is about 449.4938259148.

The spelling of 90817845 in words is "ninety million, eight hundred seventeen thousand, eight hundred forty-five".