28553320 has 16 divisors (see below), whose sum is σ = 64245060. Its totient is φ = 11421312.

The previous prime is 28553311. The next prime is 28553321. The reversal of 28553320 is 2335582.

It can be written as a sum of positive squares in 2 ways, for example, as 27941796 + 611524 = 5286^2 + 782^2 .

It is not an unprimeable number, because it can be changed into a prime (28553321) 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, 356877 + ... + 356956.

Almost surely, 2^28553320 is an apocalyptic number.

28553320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28553320 is an abundant number, since it is smaller than the sum of its proper divisors (35691740).

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

28553320 is a wasteful number, since it uses less digits than its factorization.

28553320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 713844 (or 713840 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 28553320 is about 5343.5306680134. The cubic root of 28553320 is about 305.6461086007.

The spelling of 28553320 in words is "twenty-eight million, five hundred fifty-three thousand, three hundred twenty".