28021430 has 8 divisors (see below), whose sum is σ = 50438592. Its totient is φ = 11208568.

The previous prime is 28021421. The next prime is 28021501. The reversal of 28021430 is 3412082.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1401062 + ... + 1401081.

It is an arithmetic number, because the mean of its divisors is an integer number (6304824).

Almost surely, 2^28021430 is an apocalyptic number.

28021430 is a deficient number, since it is larger than the sum of its proper divisors (22417162).

28021430 is a wasteful number, since it uses less digits than its factorization.

28021430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2802150.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 28021430 is about 5293.5271794901. The cubic root of 28021430 is about 303.7363466008.

The spelling of 28021430 in words is "twenty-eight million, twenty-one thousand, four hundred thirty".