28378052564 has 6 divisors (see below), whose sum is σ = 49661591994. Its totient is φ = 14189026280.

The previous prime is 28378052557. The next prime is 28378052567. The reversal of 28378052564 is 46525087382.

It can be written as a sum of positive squares in only one way, i.e., 27228300100 + 1149752464 = 165010^2 + 33908^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28378052567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3547256567 + ... + 3547256574.

It is an arithmetic number, because the mean of its divisors is an integer number (8276931999).

Almost surely, 2^28378052564 is an apocalyptic number.

It is an amenable number.

28378052564 is a deficient number, since it is larger than the sum of its proper divisors (21283539430).

28378052564 is a wasteful number, since it uses less digits than its factorization.

28378052564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7094513145 (or 7094513143 counting only the distinct ones).

The product of its (nonzero) digits is 3225600, while the sum is 50.

The spelling of 28378052564 in words is "twenty-eight billion, three hundred seventy-eight million, fifty-two thousand, five hundred sixty-four".