28663740388 has 24 divisors (see below), whose sum is σ = 50682542400. Its totient is φ = 14183765088.

The previous prime is 28663740377. The next prime is 28663740433. The reversal of 28663740388 is 88304736682.

It is a super-2 number, since 2×28663740388² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59283 + ... + 246661.

It is an arithmetic number, because the mean of its divisors is an integer number (2111772600).

Almost surely, 2^28663740388 is an apocalyptic number.

It is an amenable number.

28663740388 is a deficient number, since it is larger than the sum of its proper divisors (22018802012).

28663740388 is a wasteful number, since it uses less digits than its factorization.

28663740388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187779 (or 187777 counting only the distinct ones).

The product of its (nonzero) digits is 9289728, while the sum is 55.

The spelling of 28663740388 in words is "twenty-eight billion, six hundred sixty-three million, seven hundred forty thousand, three hundred eighty-eight".