28378437 has 8 divisors (see below), whose sum is σ = 38760960. Its totient is φ = 18457440.

The previous prime is 28378421. The next prime is 28378507. The reversal of 28378437 is 73487382.

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

It is not a de Polignac number, because 28378437 - 2⁴ = 28378421 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28378937) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 115237 + ... + 115482.

It is an arithmetic number, because the mean of its divisors is an integer number (4845120).

Almost surely, 2^28378437 is an apocalyptic number.

It is an amenable number.

28378437 is a deficient number, since it is larger than the sum of its proper divisors (10382523).

28378437 is a wasteful number, since it uses less digits than its factorization.

28378437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230763.

The product of its digits is 225792, while the sum is 42.

The square root of 28378437 is about 5327.1415412020. The cubic root of 28378437 is about 305.0208245210.

The spelling of 28378437 in words is "twenty-eight million, three hundred seventy-eight thousand, four hundred thirty-seven".