28401488 has 20 divisors (see below), whose sum is σ = 55118868. Its totient is φ = 14177280.

The previous prime is 28401467. The next prime is 28401497. The reversal of 28401488 is 88410482.

It can be written as a sum of positive squares in 2 ways, for example, as 5438224 + 22963264 = 2332^2 + 4792^2 .

It is a super-2 number, since 2×28401488² = 1613289041228288, which contains 22 as substring.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a congruent number.

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, 12608 + ... + 14688.

Almost surely, 2^28401488 is an apocalyptic number.

It is an amenable number.

28401488 is a deficient number, since it is larger than the sum of its proper divisors (26717380).

28401488 is a wasteful number, since it uses less digits than its factorization.

28401488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2942 (or 2936 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 35.

The square root of 28401488 is about 5329.3046450733. The cubic root of 28401488 is about 305.1033887602.

The spelling of 28401488 in words is "twenty-eight million, four hundred one thousand, four hundred eighty-eight".