90820999 has 8 divisors (see below), whose sum is σ = 92782368. Its totient is φ = 88878720.

The previous prime is 90820963. The next prime is 90821023. The reversal of 90820999 is 99902809.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 90820999 - 2⁹ = 90820487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90820909) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5059 + ... + 14395.

It is an arithmetic number, because the mean of its divisors is an integer number (11597796).

Almost surely, 2^90820999 is an apocalyptic number.

90820999 is a deficient number, since it is larger than the sum of its proper divisors (1961369).

90820999 is a wasteful number, since it uses less digits than its factorization.

90820999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9545.

The product of its (nonzero) digits is 104976, while the sum is 46.

The square root of 90820999 is about 9530.0051941224. The cubic root of 90820999 is about 449.4990293235.

It can be divided in two parts, 90820 and 999, that added together give a palindrome (91819).

The spelling of 90820999 in words is "ninety million, eight hundred twenty thousand, nine hundred ninety-nine".