28738556 has 24 divisors (see below), whose sum is σ = 62702976. Its totient is φ = 11196720.

The previous prime is 28738553. The next prime is 28738571. The reversal of 28738556 is 65583782.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28738553) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46346 + ... + 46961.

It is an arithmetic number, because the mean of its divisors is an integer number (2612624).

Almost surely, 2^28738556 is an apocalyptic number.

It is an amenable number.

28738556 is an abundant number, since it is smaller than the sum of its proper divisors (33964420).

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

28738556 is a wasteful number, since it uses less digits than its factorization.

28738556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93329 (or 93327 counting only the distinct ones).

The product of its digits is 403200, while the sum is 44.

The square root of 28738556 is about 5360.8353826619. The cubic root of 28738556 is about 306.3056310989.

The spelling of 28738556 in words is "twenty-eight million, seven hundred thirty-eight thousand, five hundred fifty-six".