90828181 has 8 divisors (see below), whose sum is σ = 92665664. Its totient is φ = 89009280.

The previous prime is 90828163. The next prime is 90828187. The reversal of 90828181 is 18182809.

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 90828181 - 2¹⁹ = 90303893 is a prime.

It is a super-2 number, since 2×90828181² = 16499516927537522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 90828181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90828187) 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, 5446 + ... + 14536.

It is an arithmetic number, because the mean of its divisors is an integer number (11583208).

Almost surely, 2^90828181 is an apocalyptic number.

It is an amenable number.

90828181 is a deficient number, since it is larger than the sum of its proper divisors (1837483).

90828181 is a wasteful number, since it uses less digits than its factorization.

90828181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9291.

The product of its (nonzero) digits is 9216, while the sum is 37.

The square root of 90828181 is about 9530.3819965414. The cubic root of 90828181 is about 449.5108776001.

The spelling of 90828181 in words is "ninety million, eight hundred twenty-eight thousand, one hundred eighty-one".