28700351887 has 4 divisors (see below), whose sum is σ = 29128715416. Its totient is φ = 28271988360.

The previous prime is 28700351791. The next prime is 28700351891. The reversal of 28700351887 is 78815300782.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28700351887 - 2⁷ = 28700351759 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28700351887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28700351387) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 214181664 + ... + 214181797.

It is an arithmetic number, because the mean of its divisors is an integer number (7282178854).

Almost surely, 2^28700351887 is an apocalyptic number.

28700351887 is a deficient number, since it is larger than the sum of its proper divisors (428363529).

28700351887 is an equidigital number, since it uses as much as digits as its factorization.

28700351887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428363528.

The product of its (nonzero) digits is 752640, while the sum is 49.

The spelling of 28700351887 in words is "twenty-eight billion, seven hundred million, three hundred fifty-one thousand, eight hundred eighty-seven".