28223670 has 32 divisors (see below), whose sum is σ = 70074720. Its totient is φ = 7266560.

The previous prime is 28223659. The next prime is 28223687. The reversal of 28223670 is 7632282.

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

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 15 ways as a sum of consecutive naturals, for example, 15351 + ... + 17090.

It is an arithmetic number, because the mean of its divisors is an integer number (2189835).

Almost surely, 2^28223670 is an apocalyptic number.

28223670 is an abundant number, since it is smaller than the sum of its proper divisors (41851050).

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

28223670 is a wasteful number, since it uses less digits than its factorization.

28223670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32480.

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 28223670 is about 5312.5954109079. The cubic root of 28223670 is about 304.4653178108.

The spelling of 28223670 in words is "twenty-eight million, two hundred twenty-three thousand, six hundred seventy".