28078740 has 72 divisors (see below), whose sum is σ = 87010560. Its totient is φ = 7326144.

The previous prime is 28078717. The next prime is 28078741. The reversal of 28078740 is 4787082.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 28078695 and 28078704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28078741) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6801 + ... + 10119.

It is an arithmetic number, because the mean of its divisors is an integer number (1208480).

Almost surely, 2^28078740 is an apocalyptic number.

28078740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28078740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43505280).

28078740 is an abundant number, since it is smaller than the sum of its proper divisors (58931820).

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

28078740 is a wasteful number, since it uses less digits than its factorization.

28078740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3381 (or 3376 counting only the distinct ones).

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

The square root of 28078740 is about 5298.9376293744. The cubic root of 28078740 is about 303.9432748500.

The spelling of 28078740 in words is "twenty-eight million, seventy-eight thousand, seven hundred forty".