28353440 has 24 divisors (see below), whose sum is σ = 66985380. Its totient is φ = 11341312.

The previous prime is 28353397. The next prime is 28353473. The reversal of 28353440 is 4435382.

It can be written as a sum of positive squares in 2 ways, for example, as 28344976 + 8464 = 5324^2 + 92^2 .

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, 88445 + ... + 88764.

Almost surely, 2^28353440 is an apocalyptic number.

28353440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28353440 is an abundant number, since it is smaller than the sum of its proper divisors (38631940).

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

28353440 is a wasteful number, since it uses less digits than its factorization.

28353440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177224 (or 177216 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 29.

The square root of 28353440 is about 5324.7948317283. The cubic root of 28353440 is about 304.9312395385.

The spelling of 28353440 in words is "twenty-eight million, three hundred fifty-three thousand, four hundred forty".