28773688 has 32 divisors (see below), whose sum is σ = 55080000. Its totient is φ = 14089600.

The previous prime is 28773683. The next prime is 28773697. The reversal of 28773688 is 88637782.

It is a super-2 number, since 2×28773688² = 1655850242242688, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28773683) 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 7 ways as a sum of consecutive naturals, for example, 120273 + ... + 120511.

It is an arithmetic number, because the mean of its divisors is an integer number (1721250).

Almost surely, 2^28773688 is an apocalyptic number.

It is an amenable number.

28773688 is a deficient number, since it is larger than the sum of its proper divisors (26306312).

28773688 is a wasteful number, since it uses less digits than its factorization.

28773688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 495 (or 491 counting only the distinct ones).

The product of its digits is 903168, while the sum is 49.

The square root of 28773688 is about 5364.1111099603. Note that the first 4 decimals coincide. The cubic root of 28773688 is about 306.4303966735.

The spelling of 28773688 in words is "twenty-eight million, seven hundred seventy-three thousand, six hundred eighty-eight".