28369278 has 96 divisors (see below), whose sum is σ = 75479040. Its totient is φ = 7814880.

The previous prime is 28369267. The next prime is 28369283. The reversal of 28369278 is 87296382.

28369278 is a nontrivial binomial coefficient, being equal to C(7533, 2).

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

Its product of digits (290304) is a multiple of the sum of its prime factors (324).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 105328 + ... + 105596.

It is an arithmetic number, because the mean of its divisors is an integer number (786240).

Almost surely, 2^28369278 is an apocalyptic number.

28369278 is the 7532-nd triangular number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28369278, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37739520).

28369278 is an abundant number, since it is smaller than the sum of its proper divisors (47109762).

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

28369278 is a wasteful number, since it uses less digits than its factorization.

28369278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324 (or 312 counting only the distinct ones).

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

The square root of 28369278 is about 5326.2818175534. The cubic root of 28369278 is about 304.9880063366.

The spelling of 28369278 in words is "twenty-eight million, three hundred sixty-nine thousand, two hundred seventy-eight".