28040449020 has 48 divisors (see below), whose sum is σ = 79588793760. Its totient is φ = 7375021056.

The previous prime is 28040448979. The next prime is 28040449061. The reversal of 28040449020 is 2094404082.

It is an interprime number because it is at equal distance from previous prime (28040448979) and next prime (28040449061).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3196585 + ... + 3205344.

It is an arithmetic number, because the mean of its divisors is an integer number (1658099870).

Almost surely, 2^28040449020 is an apocalyptic number.

28040449020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28040449020 is an abundant number, since it is smaller than the sum of its proper divisors (51548344740).

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

28040449020 is a wasteful number, since it uses less digits than its factorization.

28040449020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6402014 (or 6402012 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 33.

The spelling of 28040449020 in words is "twenty-eight billion, forty million, four hundred forty-nine thousand, twenty".