28778004 has 84 divisors (see below), whose sum is σ = 77122080. Its totient is φ = 9389520.

The previous prime is 28778003. The next prime is 28778011. The reversal of 28778004 is 40087782.

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 28778004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28778003) 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 27 ways as a sum of consecutive naturals, for example, 206967 + ... + 207105.

It is an arithmetic number, because the mean of its divisors is an integer number (918120).

Almost surely, 2^28778004 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 28778004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38561040).

28778004 is an abundant number, since it is smaller than the sum of its proper divisors (48344076).

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

28778004 is a wasteful number, since it uses less digits than its factorization.

28778004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232 (or 215 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 36.

The square root of 28778004 is about 5364.5133982496. The cubic root of 28778004 is about 306.4457172385.

The spelling of 28778004 in words is "twenty-eight million, seven hundred seventy-eight thousand, four".