28397480 has 32 divisors (see below), whose sum is σ = 67654440. Its totient is φ = 10690560.

The previous prime is 28397449. The next prime is 28397507. The reversal of 28397480 is 8479382.

It can be written as a sum of positive squares in 4 ways, for example, as 16467364 + 11930116 = 4058^2 + 3454^2 .

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 7 ways as a sum of consecutive naturals, for example, 20201 + ... + 21560.

Almost surely, 2^28397480 is an apocalyptic number.

28397480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28397480 is an abundant number, since it is smaller than the sum of its proper divisors (39256960).

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

28397480 is a wasteful number, since it uses less digits than its factorization.

28397480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41789 (or 41785 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 28397480 is about 5328.9285977577. The cubic root of 28397480 is about 305.0890360860.

The spelling of 28397480 in words is "twenty-eight million, three hundred ninety-seven thousand, four hundred eighty".