90819855 has 24 divisors (see below), whose sum is σ = 179910432. Its totient is φ = 41517504.

The previous prime is 90819853. The next prime is 90819857. The reversal of 90819855 is 55891809.

It is an interprime number because it is at equal distance from previous prime (90819853) and next prime (90819857).

It is not a de Polignac number, because 90819855 - 2¹ = 90819853 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 90819855.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90819853) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 143844 + ... + 144473.

It is an arithmetic number, because the mean of its divisors is an integer number (7496268).

Almost surely, 2^90819855 is an apocalyptic number.

90819855 is a deficient number, since it is larger than the sum of its proper divisors (89090577).

90819855 is a wasteful number, since it uses less digits than its factorization.

90819855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288335 (or 288332 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 45.

The square root of 90819855 is about 9529.9451729797. The cubic root of 90819855 is about 449.4971419882.

The spelling of 90819855 in words is "ninety million, eight hundred nineteen thousand, eight hundred fifty-five".