28402776 has 48 divisors (see below), whose sum is σ = 77627160. Its totient is φ = 9381120.

The previous prime is 28402771. The next prime is 28402793. The reversal of 28402776 is 67720482.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 28402776.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28402771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6391 + ... + 9881.

Almost surely, 2^28402776 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 28402776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38813580).

28402776 is an abundant number, since it is smaller than the sum of its proper divisors (49224384).

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

28402776 is a wasteful number, since it uses less digits than its factorization.

28402776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3616 (or 3609 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 36.

The square root of 28402776 is about 5329.4254849843. The cubic root of 28402776 is about 305.1080008099.

The spelling of 28402776 in words is "twenty-eight million, four hundred two thousand, seven hundred seventy-six".