28319430 has 64 divisors (see below), whose sum is σ = 72142848. Its totient is φ = 7102080.

The previous prime is 28319429. The next prime is 28319453. The reversal of 28319430 is 3491382.

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 31 ways as a sum of consecutive naturals, for example, 33999 + ... + 34821.

It is an arithmetic number, because the mean of its divisors is an integer number (1127232).

Almost surely, 2^28319430 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28319430, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36071424).

28319430 is an abundant number, since it is smaller than the sum of its proper divisors (43823418).

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

28319430 is a wasteful number, since it uses less digits than its factorization.

28319430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 901.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 28319430 is about 5321.6003232111. The cubic root of 28319430 is about 304.8092689089.

The spelling of 28319430 in words is "twenty-eight million, three hundred nineteen thousand, four hundred thirty".