28403740 has 24 divisors (see below), whose sum is σ = 59799600. Its totient is φ = 11332608.

The previous prime is 28403729. The next prime is 28403741. The reversal of 28403740 is 4730482.

It is a junction number, because it is equal to n+sod(n) for n = 28403699 and 28403708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28403741) 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 7 ways as a sum of consecutive naturals, for example, 7399 + ... + 10561.

It is an arithmetic number, because the mean of its divisors is an integer number (2491650).

Almost surely, 2^28403740 is an apocalyptic number.

28403740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28403740 is an abundant number, since it is smaller than the sum of its proper divisors (31395860).

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

28403740 is a wasteful number, since it uses less digits than its factorization.

28403740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3621 (or 3619 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 28.

The square root of 28403740 is about 5329.5159254852. The cubic root of 28403740 is about 305.1114525944. Note that the first 3 decimals are identical.

The spelling of 28403740 in words is "twenty-eight million, four hundred three thousand, seven hundred forty".