28040780 has 24 divisors (see below), whose sum is σ = 58999920. Its totient is φ = 11194560.

The previous prime is 28040743. The next prime is 28040791. The reversal of 28040780 is 8704082.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12806 + ... + 14834.

It is an arithmetic number, because the mean of its divisors is an integer number (2458330).

Almost surely, 2^28040780 is an apocalyptic number.

28040780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28040780 is an abundant number, since it is smaller than the sum of its proper divisors (30959140).

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

28040780 is a wasteful number, since it uses less digits than its factorization.

28040780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2729 (or 2727 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 29.

The square root of 28040780 is about 5295.3545679208. The cubic root of 28040780 is about 303.8062448415.

The spelling of 28040780 in words is "twenty-eight million, forty thousand, seven hundred eighty".