28400488 has 16 divisors (see below), whose sum is σ = 53311680. Its totient is φ = 14184048.

The previous prime is 28400473. The next prime is 28400503. The reversal of 28400488 is 88400482.

It is an interprime number because it is at equal distance from previous prime (28400473) and next prime (28400503).

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 8881 + ... + 11647.

It is an arithmetic number, because the mean of its divisors is an integer number (3331980).

Almost surely, 2^28400488 is an apocalyptic number.

It is an amenable number.

28400488 is a deficient number, since it is larger than the sum of its proper divisors (24911192).

28400488 is a wasteful number, since it uses less digits than its factorization.

28400488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4056 (or 4052 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 34.

The square root of 28400488 is about 5329.2108233771. The cubic root of 28400488 is about 305.0998078801.

The spelling of 28400488 in words is "twenty-eight million, four hundred thousand, four hundred eighty-eight".