28176840 has 192 divisors, whose sum is σ = 99066240. Its totient is φ = 6927360.

The previous prime is 28176839. The next prime is 28176857. The reversal of 28176840 is 4867182.

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 = 28176795 and 28176804.

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, 339439 + ... + 339521.

It is an arithmetic number, because the mean of its divisors is an integer number (515970).

Almost surely, 2^28176840 is an apocalyptic number.

28176840 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 28176840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49533120).

28176840 is an abundant number, since it is smaller than the sum of its proper divisors (70889400).

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

28176840 is a wasteful number, since it uses less digits than its factorization.

28176840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164 (or 157 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 28176840 is about 5308.1861308737. The cubic root of 28176840 is about 304.2968303437.

The spelling of 28176840 in words is "twenty-eight million, one hundred seventy-six thousand, eight hundred forty".