28553240 has 16 divisors (see below), whose sum is σ = 64244880. Its totient is φ = 11421280.

The previous prime is 28553209. The next prime is 28553249. The reversal of 28553240 is 4235582.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28553249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 356876 + ... + 356955.

It is an arithmetic number, because the mean of its divisors is an integer number (4015305).

Almost surely, 2^28553240 is an apocalyptic number.

28553240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28553240 is an abundant number, since it is smaller than the sum of its proper divisors (35691640).

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

28553240 is a wasteful number, since it uses less digits than its factorization.

28553240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 713842 (or 713838 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 29.

The square root of 28553240 is about 5343.5231823208. The cubic root of 28553240 is about 305.6458231498.

The spelling of 28553240 in words is "twenty-eight million, five hundred fifty-three thousand, two hundred forty".