28478922 has 16 divisors (see below), whose sum is σ = 59434560. Its totient is φ = 9080192.

The previous prime is 28478921. The next prime is 28478939. The reversal of 28478922 is 22987482.

It is a super-2 number, since 2×28478922² = 1622097996564168, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28478921) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 103047 + ... + 103322.

It is an arithmetic number, because the mean of its divisors is an integer number (3714660).

Almost surely, 2^28478922 is an apocalyptic number.

28478922 is an abundant number, since it is smaller than the sum of its proper divisors (30955638).

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

28478922 is a wasteful number, since it uses less digits than its factorization.

28478922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206397.

The product of its digits is 129024, while the sum is 42.

The square root of 28478922 is about 5336.5646252997. The cubic root of 28478922 is about 305.3804157652.

The spelling of 28478922 in words is "twenty-eight million, four hundred seventy-eight thousand, nine hundred twenty-two".