28522840 has 32 divisors (see below), whose sum is σ = 64350000. Its totient is φ = 11378304.

The previous prime is 28522831. The next prime is 28522847. The reversal of 28522840 is 4822582.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28522847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19246 + ... + 20674.

Almost surely, 2^28522840 is an apocalyptic number.

28522840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28522840 is an abundant number, since it is smaller than the sum of its proper divisors (35827160).

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

28522840 is a wasteful number, since it uses less digits than its factorization.

28522840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1939 (or 1935 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 31.

The square root of 28522840 is about 5340.6778595980. The cubic root of 28522840 is about 305.5373131931.

The spelling of 28522840 in words is "twenty-eight million, five hundred twenty-two thousand, eight hundred forty".