28063780 has 12 divisors (see below), whose sum is σ = 58933980. Its totient is φ = 11225504.

The previous prime is 28063771. The next prime is 28063801. The reversal of 28063780 is 8736082.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 6885376 + 21178404 = 2624^2 + 4602^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 701575 + ... + 701614.

It is an arithmetic number, because the mean of its divisors is an integer number (4911165).

Almost surely, 2^28063780 is an apocalyptic number.

28063780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28063780 is an abundant number, since it is smaller than the sum of its proper divisors (30870200).

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

28063780 is a wasteful number, since it uses less digits than its factorization.

28063780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1403198 (or 1403196 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 28063780 is about 5297.5258375963. The cubic root of 28063780 is about 303.8892862076.

The spelling of 28063780 in words is "twenty-eight million, sixty-three thousand, seven hundred eighty".