28277844 has 48 divisors (see below), whose sum is σ = 75790848. Its totient is φ = 8038368.

The previous prime is 28277839. The next prime is 28277849. The reversal of 28277844 is 44877282.

It is an interprime number because it is at equal distance from previous prime (28277839) and next prime (28277849).

It is a super-2 number, since 2×28277844² = 1599272922576672, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 28277796 and 28277805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28277849) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18327 + ... + 19809.

It is an arithmetic number, because the mean of its divisors is an integer number (1578976).

Almost surely, 2^28277844 is an apocalyptic number.

It is an amenable number.

28277844 is an abundant number, since it is smaller than the sum of its proper divisors (47513004).

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

28277844 is a wasteful number, since it uses less digits than its factorization.

28277844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1724 (or 1722 counting only the distinct ones).

The product of its digits is 200704, while the sum is 42.

The square root of 28277844 is about 5317.6916044464. The cubic root of 28277844 is about 304.6599955659.

The spelling of 28277844 in words is "twenty-eight million, two hundred seventy-seven thousand, eight hundred forty-four".