28177275947 has 2 divisors, whose sum is σ = 28177275948. Its totient is φ = 28177275946.

The previous prime is 28177275943. The next prime is 28177275979. The reversal of 28177275947 is 74957277182.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28177275947 - 2² = 28177275943 is a prime.

It is not a weakly prime, because it can be changed into another prime (28177275943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14088637973 + 14088637974.

It is an arithmetic number, because the mean of its divisors is an integer number (14088637974).

Almost surely, 2^28177275947 is an apocalyptic number.

28177275947 is a deficient number, since it is larger than the sum of its proper divisors (1).

28177275947 is an equidigital number, since it uses as much as digits as its factorization.

28177275947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13829760, while the sum is 59.

The spelling of 28177275947 in words is "twenty-eight billion, one hundred seventy-seven million, two hundred seventy-five thousand, nine hundred forty-seven".