28115910 has 80 divisors (see below), whose sum is σ = 76561056. Its totient is φ = 7402752.

The previous prime is 28115897. The next prime is 28115939. The reversal of 28115910 is 1951182.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 83262 + ... + 83598.

Almost surely, 2^28115910 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28115910, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38280528).

28115910 is an abundant number, since it is smaller than the sum of its proper divisors (48445146).

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

28115910 is a wasteful number, since it uses less digits than its factorization.

28115910 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 459 (or 450 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 27.

The square root of 28115910 is about 5302.4437762224. The cubic root of 28115910 is about 304.0773334536.

The spelling of 28115910 in words is "twenty-eight million, one hundred fifteen thousand, nine hundred ten".