28117470 has 32 divisors (see below), whose sum is σ = 67779360. Its totient is φ = 7464960.

The previous prime is 28117433. The next prime is 28117489. The reversal of 28117470 is 7471182.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5286 + ... + 9174.

It is an arithmetic number, because the mean of its divisors is an integer number (2118105).

Almost surely, 2^28117470 is an apocalyptic number.

28117470 is an abundant number, since it is smaller than the sum of its proper divisors (39661890).

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

28117470 is a wasteful number, since it uses less digits than its factorization.

28117470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4140.

The product of its (nonzero) digits is 3136, while the sum is 30.

The square root of 28117470 is about 5302.5908761661. The cubic root of 28117470 is about 304.0829572193.

The spelling of 28117470 in words is "twenty-eight million, one hundred seventeen thousand, four hundred seventy".