28394424 has 24 divisors (see below), whose sum is σ = 76901760. Its totient is φ = 9464784.

The previous prime is 28394413. The next prime is 28394441. The reversal of 28394424 is 42449382.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 197112 + ... + 197255.

It is an arithmetic number, because the mean of its divisors is an integer number (3204240).

Almost surely, 2^28394424 is an apocalyptic number.

28394424 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

28394424 is an abundant number, since it is smaller than the sum of its proper divisors (48507336).

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

28394424 is a wasteful number, since it uses less digits than its factorization.

28394424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394379 (or 394372 counting only the distinct ones).

The product of its digits is 55296, while the sum is 36.

The square root of 28394424 is about 5328.6418532305. The cubic root of 28394424 is about 305.0780916226.

The spelling of 28394424 in words is "twenty-eight million, three hundred ninety-four thousand, four hundred twenty-four".