28748938 has 32 divisors (see below), whose sum is σ = 48522240. Its totient is φ = 12695040.

The previous prime is 28748927. The next prime is 28748939. The reversal of 28748938 is 83984782.

It is a super-2 number, since 2×28748938² = 1653002872255688, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28748891 and 28748900.

It is not an unprimeable number, because it can be changed into a prime (28748939) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 123270 + ... + 123502.

It is an arithmetic number, because the mean of its divisors is an integer number (1516320).

Almost surely, 2^28748938 is an apocalyptic number.

28748938 is a deficient number, since it is larger than the sum of its proper divisors (19773302).

28748938 is a wasteful number, since it uses less digits than its factorization.

28748938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 462.

The product of its digits is 774144, while the sum is 49.

The square root of 28748938 is about 5361.8036144566. The cubic root of 28748938 is about 306.3425116599.

The spelling of 28748938 in words is "twenty-eight million, seven hundred forty-eight thousand, nine hundred thirty-eight".