28626615377 has 2 divisors, whose sum is σ = 28626615378. Its totient is φ = 28626615376.

The previous prime is 28626615319. The next prime is 28626615379. The reversal of 28626615377 is 77351662682.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28234416961 + 392198416 = 168031^2 + 19804^2 .

It is a cyclic number.

It is not a de Polignac number, because 28626615377 - 2⁶ = 28626615313 is a prime.

Together with 28626615379, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28626615379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14313307688 + 14313307689.

It is an arithmetic number, because the mean of its divisors is an integer number (14313307689).

Almost surely, 2^28626615377 is an apocalyptic number.

It is an amenable number.

28626615377 is a deficient number, since it is larger than the sum of its proper divisors (1).

28626615377 is an equidigital number, since it uses as much as digits as its factorization.

28626615377 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5080320, while the sum is 53.

The spelling of 28626615377 in words is "twenty-eight billion, six hundred twenty-six million, six hundred fifteen thousand, three hundred seventy-seven".