28405248 has 40 divisors (see below), whose sum is σ = 75677448. Its totient is φ = 9467904.

The previous prime is 28405243. The next prime is 28405259. The reversal of 28405248 is 84250482.

It is a happy number.

It is a super-2 number, since 2×28405248² = 1613716227883008, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28405243) 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, 7711 + ... + 10782.

Almost surely, 2^28405248 is an apocalyptic number.

It is an amenable number.

28405248 is an abundant number, since it is smaller than the sum of its proper divisors (47272200).

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

28405248 is an equidigital number, since it uses as much as digits as its factorization.

28405248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18514 (or 18498 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 33.

The square root of 28405248 is about 5329.6573998710. The cubic root of 28405248 is about 305.1168521172.

The spelling of 28405248 in words is "twenty-eight million, four hundred five thousand, two hundred forty-eight".