28383351881 has 2 divisors, whose sum is σ = 28383351882. Its totient is φ = 28383351880.

The previous prime is 28383351877. The next prime is 28383351923. The reversal of 28383351881 is 18815338382.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26518494025 + 1864857856 = 162845^2 + 43184^2 .

It is a cyclic number.

It is not a de Polignac number, because 28383351881 - 2² = 28383351877 is a prime.

It is a super-2 number, since 2×28383351881² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28383351851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14191675940 + 14191675941.

It is an arithmetic number, because the mean of its divisors is an integer number (14191675941).

Almost surely, 2^28383351881 is an apocalyptic number.

It is an amenable number.

28383351881 is a deficient number, since it is larger than the sum of its proper divisors (1).

28383351881 is an equidigital number, since it uses as much as digits as its factorization.

28383351881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1105920, while the sum is 50.

The spelling of 28383351881 in words is "twenty-eight billion, three hundred eighty-three million, three hundred fifty-one thousand, eight hundred eighty-one".