28378416 has 80 divisors (see below), whose sum is σ = 81209088. Its totient is φ = 8467200.

The previous prime is 28378411. The next prime is 28378421. The reversal of 28378416 is 61487382.

It is an interprime number because it is at equal distance from previous prime (28378411) and next prime (28378421).

It is not an unprimeable number, because it can be changed into a prime (28378411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37110 + ... + 37866.

Almost surely, 2^28378416 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 28378416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40604544).

28378416 is an abundant number, since it is smaller than the sum of its proper divisors (52830672).

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

28378416 is a wasteful number, since it uses less digits than its factorization.

28378416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 850 (or 844 counting only the distinct ones).

The product of its digits is 64512, while the sum is 39.

The square root of 28378416 is about 5327.1395701633. The cubic root of 28378416 is about 305.0207492826.

The spelling of 28378416 in words is "twenty-eight million, three hundred seventy-eight thousand, four hundred sixteen".