28401773887 has 2 divisors, whose sum is σ = 28401773888. Its totient is φ = 28401773886.

The previous prime is 28401773863. The next prime is 28401773927. The reversal of 28401773887 is 78837710482.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28401773887 - 2²⁷ = 28267556159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28401773837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14200886943 + 14200886944.

It is an arithmetic number, because the mean of its divisors is an integer number (14200886944).

Almost surely, 2^28401773887 is an apocalyptic number.

28401773887 is a deficient number, since it is larger than the sum of its proper divisors (1).

28401773887 is an equidigital number, since it uses as much as digits as its factorization.

28401773887 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4214784, while the sum is 55.

The spelling of 28401773887 in words is "twenty-eight billion, four hundred one million, seven hundred seventy-three thousand, eight hundred eighty-seven".