28921086 has 24 divisors (see below), whose sum is σ = 63600264. Its totient is φ = 9496080.

The previous prime is 28921073. The next prime is 28921099. The reversal of 28921086 is 68012982.

It is an interprime number because it is at equal distance from previous prime (28921073) and next prime (28921099).

It is a super-3 number, since 3×28921086³ (a number of 23 digits) contains 333 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28921086.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10785 + ... + 13196.

It is an arithmetic number, because the mean of its divisors is an integer number (2650011).

Almost surely, 2^28921086 is an apocalyptic number.

28921086 is an abundant number, since it is smaller than the sum of its proper divisors (34679178).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28921086 is a wasteful number, since it uses less digits than its factorization.

28921086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24056 (or 24053 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 28921086 is about 5377.8328348880. The cubic root of 28921086 is about 306.9527526168.

The spelling of 28921086 in words is "twenty-eight million, nine hundred twenty-one thousand, eighty-six".