28780712 has 8 divisors (see below), whose sum is σ = 53963850. Its totient is φ = 14390352.

The previous prime is 28780693. The next prime is 28780723. The reversal of 28780712 is 21708782.

It can be written as a sum of positive squares in only one way, i.e., 22600516 + 6180196 = 4754^2 + 2486^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1798787 + ... + 1798802.

Almost surely, 2^28780712 is an apocalyptic number.

It is an amenable number.

28780712 is a deficient number, since it is larger than the sum of its proper divisors (25183138).

28780712 is a wasteful number, since it uses less digits than its factorization.

28780712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3597595 (or 3597591 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 35.

The square root of 28780712 is about 5364.7657917192. The cubic root of 28780712 is about 306.4553290816.

It can be divided in two parts, 28780 and 712, that added together give a palindrome (29492).

The spelling of 28780712 in words is "twenty-eight million, seven hundred eighty thousand, seven hundred twelve".