28478826 has 48 divisors (see below), whose sum is σ = 64502568. Its totient is φ = 9072000.

The previous prime is 28478809. The next prime is 28478839. The reversal of 28478826 is 62887482.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 26532801 + 1946025 = 5151^2 + 1395^2 .

It is a super-2 number, since 2×28478826² = 1622087060676552, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40276 + ... + 40976.

Almost surely, 2^28478826 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28478826, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32251284).

28478826 is an abundant number, since it is smaller than the sum of its proper divisors (36023742).

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

28478826 is a wasteful number, since it uses less digits than its factorization.

28478826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 807 (or 804 counting only the distinct ones).

The product of its digits is 344064, while the sum is 45.

The square root of 28478826 is about 5336.5556307416. Note that the first 3 decimals coincide. The cubic root of 28478826 is about 305.3800726277.

The spelling of 28478826 in words is "twenty-eight million, four hundred seventy-eight thousand, eight hundred twenty-six".