28376507989 has 2 divisors, whose sum is σ = 28376507990. Its totient is φ = 28376507988.

The previous prime is 28376507977. The next prime is 28376508029. The reversal of 28376507989 is 98970567382.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17145807364 + 11230700625 = 130942^2 + 105975^2 .

It is a cyclic number.

It is not a de Polignac number, because 28376507989 - 2⁹ = 28376507477 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28376507989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28376577989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14188253994 + 14188253995.

It is an arithmetic number, because the mean of its divisors is an integer number (14188253995).

Almost surely, 2^28376507989 is an apocalyptic number.

It is an amenable number.

28376507989 is a deficient number, since it is larger than the sum of its proper divisors (1).

28376507989 is an equidigital number, since it uses as much as digits as its factorization.

28376507989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45722880, while the sum is 64.

The spelling of 28376507989 in words is "twenty-eight billion, three hundred seventy-six million, five hundred seven thousand, nine hundred eighty-nine".