28403408 has 40 divisors (see below), whose sum is σ = 60906816. Its totient is φ = 12723200.

The previous prime is 28403393. The next prime is 28403429. The reversal of 28403408 is 80430482.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11360 + ... + 13632.

Almost surely, 2^28403408 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28403408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30453408).

28403408 is an abundant number, since it is smaller than the sum of its proper divisors (32503408).

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

28403408 is a wasteful number, since it uses less digits than its factorization.

28403408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2363 (or 2357 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 29.

The square root of 28403408 is about 5329.4847781000. The cubic root of 28403408 is about 305.1102638144.

The spelling of 28403408 in words is "twenty-eight million, four hundred three thousand, four hundred eight".