28773428 has 6 divisors (see below), whose sum is σ = 50353506. Its totient is φ = 14386712.

The previous prime is 28773427. The next prime is 28773439. The reversal of 28773428 is 82437782.

It can be written as a sum of positive squares in only one way, i.e., 16467364 + 12306064 = 4058^2 + 3508^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28773427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3596675 + ... + 3596682.

It is an arithmetic number, because the mean of its divisors is an integer number (8392251).

Almost surely, 2^28773428 is an apocalyptic number.

It is an amenable number.

28773428 is a deficient number, since it is larger than the sum of its proper divisors (21580078).

28773428 is a wasteful number, since it uses less digits than its factorization.

28773428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7193361 (or 7193359 counting only the distinct ones).

The product of its digits is 150528, while the sum is 41.

The square root of 28773428 is about 5364.0868747626. The cubic root of 28773428 is about 306.4294736990.

The spelling of 28773428 in words is "twenty-eight million, seven hundred seventy-three thousand, four hundred twenty-eight".