28665378 has 48 divisors (see below), whose sum is σ = 71862336. Its totient is φ = 8088480.

The previous prime is 28665367. The next prime is 28665389. The reversal of 28665378 is 87356682.

It is an interprime number because it is at equal distance from previous prime (28665367) and next prime (28665389).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9088 + ... + 11828.

It is an arithmetic number, because the mean of its divisors is an integer number (1497132).

Almost surely, 2^28665378 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28665378, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35931168).

28665378 is an abundant number, since it is smaller than the sum of its proper divisors (43196958).

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

28665378 is a wasteful number, since it uses less digits than its factorization.

28665378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2839 (or 2836 counting only the distinct ones).

The product of its digits is 483840, while the sum is 45.

The square root of 28665378 is about 5354.0057900604. The cubic root of 28665378 is about 306.0454245010.

The spelling of 28665378 in words is "twenty-eight million, six hundred sixty-five thousand, three hundred seventy-eight".