28379157881 has 2 divisors, whose sum is σ = 28379157882. Its totient is φ = 28379157880.

The previous prime is 28379157871. The next prime is 28379157941. The reversal of 28379157881 is 18875197382.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27617121856 + 762036025 = 166184^2 + 27605^2 .

It is a cyclic number.

It is not a de Polignac number, because 28379157881 - 2³⁰ = 27305416057 is a prime.

It is a super-2 number, since 2×28379157881² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28379157881.

It is not a weakly prime, because it can be changed into another prime (28379157811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14189578940 + 14189578941.

It is an arithmetic number, because the mean of its divisors is an integer number (14189578941).

Almost surely, 2^28379157881 is an apocalyptic number.

It is an amenable number.

28379157881 is a deficient number, since it is larger than the sum of its proper divisors (1).

28379157881 is an equidigital number, since it uses as much as digits as its factorization.

28379157881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6773760, while the sum is 59.

The spelling of 28379157881 in words is "twenty-eight billion, three hundred seventy-nine million, one hundred fifty-seven thousand, eight hundred eighty-one".