28910385 has 32 divisors (see below), whose sum is σ = 58740480. Its totient is φ = 13215744.

The previous prime is 28910377. The next prime is 28910393. The reversal of 28910385 is 58301982.

It is an interprime number because it is at equal distance from previous prime (28910377) and next prime (28910393).

It is not a de Polignac number, because 28910385 - 2³ = 28910377 is a prime.

It is a super-3 number, since 3×28910385³ (a number of 23 digits) contains 333 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14352 + ... + 16241.

It is an arithmetic number, because the mean of its divisors is an integer number (1835640).

Almost surely, 2^28910385 is an apocalyptic number.

It is an amenable number.

28910385 is an abundant number, since it is smaller than the sum of its proper divisors (29830095).

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

28910385 is a wasteful number, since it uses less digits than its factorization.

28910385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30614 (or 30608 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 28910385 is about 5376.8378253394. The cubic root of 28910385 is about 306.9148897393.

The spelling of 28910385 in words is "twenty-eight million, nine hundred ten thousand, three hundred eighty-five".