28315826477 has 2 divisors, whose sum is σ = 28315826478. Its totient is φ = 28315826476.

The previous prime is 28315826431. The next prime is 28315826507. The reversal of 28315826477 is 77462851382.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25914238441 + 2401588036 = 160979^2 + 49006^2 .

It is a cyclic number.

It is not a de Polignac number, because 28315826477 - 2¹⁴ = 28315810093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28315822477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14157913238 + 14157913239.

It is an arithmetic number, because the mean of its divisors is an integer number (14157913239).

Almost surely, 2^28315826477 is an apocalyptic number.

It is an amenable number.

28315826477 is a deficient number, since it is larger than the sum of its proper divisors (1).

28315826477 is an equidigital number, since it uses as much as digits as its factorization.

28315826477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4515840, while the sum is 53.

The spelling of 28315826477 in words is "twenty-eight billion, three hundred fifteen million, eight hundred twenty-six thousand, four hundred seventy-seven".