28774656 has 144 divisors (see below), whose sum is σ = 89281920. Its totient is φ = 9123840.

The previous prime is 28774643. The next prime is 28774663. The reversal of 28774656 is 65647782.

It is a tau number, because it is divible by the number of its divisors (144).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 158886 + ... + 159066.

Almost surely, 2^28774656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28774656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44640960).

28774656 is an abundant number, since it is smaller than the sum of its proper divisors (60507264).

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

28774656 is a wasteful number, since it uses less digits than its factorization.

28774656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229 (or 209 counting only the distinct ones).

The product of its digits is 564480, while the sum is 45.

The square root of 28774656 is about 5364.2013385032. The cubic root of 28774656 is about 306.4338329298.

The spelling of 28774656 in words is "twenty-eight million, seven hundred seventy-four thousand, six hundred fifty-six".