28757612978 has 16 divisors (see below), whose sum is σ = 43868610240. Its totient is φ = 14136752016.

The previous prime is 28757612969. The next prime is 28757612987. The reversal of 28757612978 is 87921675782.

It is an interprime number because it is at equal distance from previous prime (28757612969) and next prime (28757612987).

It is a self number, because there is not a number n which added to its sum of digits gives 28757612978.

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 in 7 ways as a sum of consecutive naturals, for example, 473525 + ... + 530792.

It is an arithmetic number, because the mean of its divisors is an integer number (2741788140).

Almost surely, 2^28757612978 is an apocalyptic number.

28757612978 is a deficient number, since it is larger than the sum of its proper divisors (15110997262).

28757612978 is a wasteful number, since it uses less digits than its factorization.

28757612978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1004561.

The product of its digits is 23708160, while the sum is 62.

The spelling of 28757612978 in words is "twenty-eight billion, seven hundred fifty-seven million, six hundred twelve thousand, nine hundred seventy-eight".