28126780 has 24 divisors (see below), whose sum is σ = 64436400. Its totient is φ = 10227840.

The previous prime is 28126757. The next prime is 28126793. The reversal of 28126780 is 8762182.

It is a super-2 number, since 2×28126780² = 1582231506336800, which contains 22 as substring.

It is a congruent number.

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, 63705 + ... + 64144.

It is an arithmetic number, because the mean of its divisors is an integer number (2684850).

Almost surely, 2^28126780 is an apocalyptic number.

28126780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28126780 is an abundant number, since it is smaller than the sum of its proper divisors (36309620).

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

28126780 is a wasteful number, since it uses less digits than its factorization.

28126780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127869 (or 127867 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 28126780 is about 5303.4686762533. The cubic root of 28126780 is about 304.1165152401.

The spelling of 28126780 in words is "twenty-eight million, one hundred twenty-six thousand, seven hundred eighty".