28030780 has 48 divisors (see below), whose sum is σ = 60520320. Its totient is φ = 10902528.

The previous prime is 28030763. The next prime is 28030801. The reversal of 28030780 is 8703082.

It is a happy number.

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, 178462 + ... + 178618.

It is an arithmetic number, because the mean of its divisors is an integer number (1260840).

Almost surely, 2^28030780 is an apocalyptic number.

28030780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28030780 is an abundant number, since it is smaller than the sum of its proper divisors (32489540).

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

28030780 is a wasteful number, since it uses less digits than its factorization.

28030780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358 (or 356 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 28030780 is about 5294.4102598873. The cubic root of 28030780 is about 303.7701257361.

The spelling of 28030780 in words is "twenty-eight million, thirty thousand, seven hundred eighty".