28042438 has 8 divisors (see below), whose sum is σ = 42124320. Its totient is φ = 14001000.

The previous prime is 28042397. The next prime is 28042447. The reversal of 28042438 is 83424082.

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, 8313 + ... + 11188.

It is an arithmetic number, because the mean of its divisors is an integer number (5265540).

Almost surely, 2^28042438 is an apocalyptic number.

28042438 is a deficient number, since it is larger than the sum of its proper divisors (14081882).

28042438 is a wasteful number, since it uses less digits than its factorization.

28042438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20222.

The product of its (nonzero) digits is 12288, while the sum is 31.

The square root of 28042438 is about 5295.5111179186. The cubic root of 28042438 is about 303.8122325593.

The spelling of 28042438 in words is "twenty-eight million, forty-two thousand, four hundred thirty-eight".