28904190877 has 2 divisors, whose sum is σ = 28904190878. Its totient is φ = 28904190876.

The previous prime is 28904190869. The next prime is 28904190899. The reversal of 28904190877 is 77809140982.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19018064836 + 9886126041 = 137906^2 + 99429^2 .

It is a cyclic number.

It is not a de Polignac number, because 28904190877 - 2³ = 28904190869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28904190817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14452095438 + 14452095439.

It is an arithmetic number, because the mean of its divisors is an integer number (14452095439).

Almost surely, 2^28904190877 is an apocalyptic number.

It is an amenable number.

28904190877 is a deficient number, since it is larger than the sum of its proper divisors (1).

28904190877 is an equidigital number, since it uses as much as digits as its factorization.

28904190877 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2032128, while the sum is 55.

The spelling of 28904190877 in words is "twenty-eight billion, nine hundred four million, one hundred ninety thousand, eight hundred seventy-seven".