28990055 has 8 divisors (see below), whose sum is σ = 35728512. Its totient is φ = 22565088.

The previous prime is 28990021. The next prime is 28990057. The reversal of 28990055 is 55009982.

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 28990055 - 2⁸ = 28989799 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 (28990057) 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, 78167 + ... + 78536.

It is an arithmetic number, because the mean of its divisors is an integer number (4466064).

Almost surely, 2^28990055 is an apocalyptic number.

28990055 is a deficient number, since it is larger than the sum of its proper divisors (6738457).

28990055 is a wasteful number, since it uses less digits than its factorization.

28990055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156745.

The product of its (nonzero) digits is 32400, while the sum is 38.

The square root of 28990055 is about 5384.2413578888. The cubic root of 28990055 is about 307.1965587937.

The spelling of 28990055 in words is "twenty-eight million, nine hundred ninety thousand, fifty-five".