28507620961 has 2 divisors, whose sum is σ = 28507620962. Its totient is φ = 28507620960.

The previous prime is 28507620959. The next prime is 28507620971. The reversal of 28507620961 is 16902670582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28458003025 + 49617936 = 168695^2 + 7044^2 .

It is a cyclic number.

It is not a de Polignac number, because 28507620961 - 2¹ = 28507620959 is a prime.

Together with 28507620959, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (28507620901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14253810480 + 14253810481.

It is an arithmetic number, because the mean of its divisors is an integer number (14253810481).

Almost surely, 2^28507620961 is an apocalyptic number.

It is an amenable number.

28507620961 is a deficient number, since it is larger than the sum of its proper divisors (1).

28507620961 is an equidigital number, since it uses as much as digits as its factorization.

28507620961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 362880, while the sum is 46.

The spelling of 28507620961 in words is "twenty-eight billion, five hundred seven million, six hundred twenty thousand, nine hundred sixty-one".