28777044 has 12 divisors (see below), whose sum is σ = 67146464. Its totient is φ = 9592344.

The previous prime is 28777043. The next prime is 28777051. The reversal of 28777044 is 44077782.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×28777044² = 1656236522755872, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28776993 and 28777011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28777043) 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, 1199032 + ... + 1199055.

Almost surely, 2^28777044 is an apocalyptic number.

It is an amenable number.

28777044 is an abundant number, since it is smaller than the sum of its proper divisors (38369420).

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

28777044 is a wasteful number, since it uses less digits than its factorization.

28777044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2398094 (or 2398092 counting only the distinct ones).

The product of its (nonzero) digits is 87808, while the sum is 39.

The square root of 28777044 is about 5364.4239206088. The cubic root of 28777044 is about 306.4423096457.

The spelling of 28777044 in words is "twenty-eight million, seven hundred seventy-seven thousand, forty-four".