28269378 has 64 divisors (see below), whose sum is σ = 67392000. Its totient is φ = 8757072.

The previous prime is 28269313. The next prime is 28269379. The reversal of 28269378 is 87396282.

It is not an unprimeable number, because it can be changed into a prime (28269379) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 60301 + ... + 60767.

It is an arithmetic number, because the mean of its divisors is an integer number (1053000).

Almost surely, 2^28269378 is an apocalyptic number.

28269378 is the 3363-rd heptagonal number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28269378, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33696000).

28269378 is an abundant number, since it is smaller than the sum of its proper divisors (39122622).

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

28269378 is a wasteful number, since it uses less digits than its factorization.

28269378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 556 (or 550 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 28269378 is about 5316.8955227651. The cubic root of 28269378 is about 304.6295888517.

The spelling of 28269378 in words is "twenty-eight million, two hundred sixty-nine thousand, three hundred seventy-eight".