28470 has 32 divisors (see below), whose sum is σ = 74592. Its totient is φ = 6912.

The previous prime is 28463. The next prime is 28477. The reversal of 28470 is 7482.

28470 = T₇₅ + T₇₆ + ... + T₈₃.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28463) and next prime (28477).

It is a Curzon number.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28477) by changing a digit.

28470 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 354 + ... + 426.

It is an arithmetic number, because the mean of its divisors is an integer number (2331).

2²⁸⁴⁷⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28470, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37296).

28470 is an abundant number, since it is smaller than the sum of its proper divisors (46122).

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

28470 is a wasteful number, since it uses less digits than its factorization.

28470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96.

The product of its (nonzero) digits is 448, while the sum is 21.

The square root of 28470 is about 168.7305544352. The cubic root of 28470 is about 30.5348522135.

The spelling of 28470 in words is "twenty-eight thousand, four hundred seventy".