28977205129 has 2 divisors, whose sum is σ = 28977205130. Its totient is φ = 28977205128.

The previous prime is 28977205093. The next prime is 28977205183. The reversal of 28977205129 is 92150277982.

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., 16442163529 + 12535041600 = 128227^2 + 111960^2 .

It is a cyclic number.

It is not a de Polignac number, because 28977205129 - 2⁹ = 28977204617 is a prime.

It is not a weakly prime, because it can be changed into another prime (28977205429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14488602564 + 14488602565.

It is an arithmetic number, because the mean of its divisors is an integer number (14488602565).

Almost surely, 2^28977205129 is an apocalyptic number.

It is an amenable number.

28977205129 is a deficient number, since it is larger than the sum of its proper divisors (1).

28977205129 is an equidigital number, since it uses as much as digits as its factorization.

28977205129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1270080, while the sum is 52.

The spelling of 28977205129 in words is "twenty-eight billion, nine hundred seventy-seven million, two hundred five thousand, one hundred twenty-nine".