28748538 has 48 divisors (see below), whose sum is σ = 76667136. Its totient is φ = 7581600.

The previous prime is 28748521. The next prime is 28748543. The reversal of 28748538 is 83584782.

It is a junction number, because it is equal to n+sod(n) for n = 28748493 and 28748502.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7138 + ... + 10413.

It is an arithmetic number, because the mean of its divisors is an integer number (1597232).

Almost surely, 2^28748538 is an apocalyptic number.

28748538 is an abundant number, since it is smaller than the sum of its proper divisors (47918598).

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

28748538 is a wasteful number, since it uses less digits than its factorization.

28748538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17579 (or 17576 counting only the distinct ones).

The product of its digits is 430080, while the sum is 45.

The square root of 28748538 is about 5361.7663134456. The cubic root of 28748538 is about 306.3410908819.

The spelling of 28748538 in words is "twenty-eight million, seven hundred forty-eight thousand, five hundred thirty-eight".