28448940 has 48 divisors (see below), whose sum is σ = 85786848. Its totient is φ = 7002624.

The previous prime is 28448921. The next prime is 28448977. The reversal of 28448940 is 4984482.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17457 + ... + 19016.

It is an arithmetic number, because the mean of its divisors is an integer number (1787226).

Almost surely, 2^28448940 is an apocalyptic number.

28448940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28448940 is an abundant number, since it is smaller than the sum of its proper divisors (57337908).

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

28448940 is a wasteful number, since it uses less digits than its factorization.

28448940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36498 (or 36496 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 39.

The square root of 28448940 is about 5333.7547750154. The cubic root of 28448940 is about 305.2732121456.

The spelling of 28448940 in words is "twenty-eight million, four hundred forty-eight thousand, nine hundred forty".