28129813456 has 10 divisors (see below), whose sum is σ = 54501513602. Its totient is φ = 14064906720.

The previous prime is 28129813423. The next prime is 28129813477. The reversal of 28129813456 is 65431892182.

It can be written as a sum of positive squares in only one way, i.e., 26732250000 + 1397563456 = 163500^2 + 37384^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 879056655 + ... + 879056686.

Almost surely, 2^28129813456 is an apocalyptic number.

It is an amenable number.

28129813456 is a deficient number, since it is larger than the sum of its proper divisors (26371700146).

28129813456 is a wasteful number, since it uses less digits than its factorization.

28129813456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1758113349 (or 1758113343 counting only the distinct ones).

The product of its digits is 829440, while the sum is 49.

The spelling of 28129813456 in words is "twenty-eight billion, one hundred twenty-nine million, eight hundred thirteen thousand, four hundred fifty-six".