28778224 has 10 divisors (see below), whose sum is σ = 55757840. Its totient is φ = 14389104.

The previous prime is 28778219. The next prime is 28778231. The reversal of 28778224 is 42287782.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 899304 + ... + 899335.

It is an arithmetic number, because the mean of its divisors is an integer number (5575784).

Almost surely, 2^28778224 is an apocalyptic number.

It is an amenable number.

28778224 is a deficient number, since it is larger than the sum of its proper divisors (26979616).

28778224 is a wasteful number, since it uses less digits than its factorization.

28778224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1798647 (or 1798641 counting only the distinct ones).

The product of its digits is 100352, while the sum is 40.

The square root of 28778224 is about 5364.5339033321. The cubic root of 28778224 is about 306.4464981345.

The spelling of 28778224 in words is "twenty-eight million, seven hundred seventy-eight thousand, two hundred twenty-four".