28777528 has 16 divisors (see below), whose sum is σ = 58108680. Its totient is φ = 13281888.

The previous prime is 28777523. The next prime is 28777537. The reversal of 28777528 is 82577782.

It is a super-2 number, since 2×28777528² = 1656292235581568, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28777523) 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 3 ways as a sum of consecutive naturals, for example, 138250 + ... + 138457.

Almost surely, 2^28777528 is an apocalyptic number.

It is an amenable number.

28777528 is an abundant number, since it is smaller than the sum of its proper divisors (29331152).

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

28777528 is a wasteful number, since it uses less digits than its factorization.

28777528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276726 (or 276722 counting only the distinct ones).

The product of its digits is 439040, while the sum is 46.

The square root of 28777528 is about 5364.4690324393. The cubic root of 28777528 is about 306.4440276499. Note that the first 3 decimals are identical.

It can be divided in two parts, 287 and 77528, that added together give a triangular number (77815 = T₃₉₄).

The spelling of 28777528 in words is "twenty-eight million, seven hundred seventy-seven thousand, five hundred twenty-eight".