28918438 has 8 divisors (see below), whose sum is σ = 43569432. Its totient is φ = 14395296.

The previous prime is 28918433. The next prime is 28918441. The reversal of 28918438 is 83481982.

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

It is a junction number, because it is equal to n+sod(n) for n = 28918394 and 28918403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28918433) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31395 + ... + 32302.

It is an arithmetic number, because the mean of its divisors is an integer number (5446179).

Almost surely, 2^28918438 is an apocalyptic number.

28918438 is a deficient number, since it is larger than the sum of its proper divisors (14650994).

28918438 is a wasteful number, since it uses less digits than its factorization.

28918438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63926.

The product of its digits is 110592, while the sum is 43.

The square root of 28918438 is about 5377.5866334258. The cubic root of 28918438 is about 306.9433841846.

The spelling of 28918438 in words is "twenty-eight million, nine hundred eighteen thousand, four hundred thirty-eight".