28124740 has 24 divisors (see below), whose sum is σ = 67499712. Its totient is φ = 9642720.

The previous prime is 28124717. The next prime is 28124771. The reversal of 28124740 is 4742182.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 28124699 and 28124708.

It is an unprimeable number.

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, 100306 + ... + 100585.

It is an arithmetic number, because the mean of its divisors is an integer number (2812488).

Almost surely, 2^28124740 is an apocalyptic number.

28124740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28124740 is an abundant number, since it is smaller than the sum of its proper divisors (39374972).

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

28124740 is a wasteful number, since it uses less digits than its factorization.

28124740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200907 (or 200905 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 28.

The square root of 28124740 is about 5303.2763458074. The cubic root of 28124740 is about 304.1091626661.

The spelling of 28124740 in words is "twenty-eight million, one hundred twenty-four thousand, seven hundred forty".