28057762457 has 4 divisors (see below), whose sum is σ = 28073769780. Its totient is φ = 28041755136.

The previous prime is 28057762417. The next prime is 28057762477. The reversal of 28057762457 is 75426775082.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75426775082 = 2 ⋅37713387541.

It can be written as a sum of positive squares in 2 ways, for example, as 1768707136 + 26289055321 = 42056^2 + 162139^2 .

It is a cyclic number.

It is not a de Polignac number, because 28057762457 - 2¹⁸ = 28057500313 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28057762399 and 28057762408.

It is not an unprimeable number, because it can be changed into a prime (28057762417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8001032 + ... + 8004537.

It is an arithmetic number, because the mean of its divisors is an integer number (7018442445).

Almost surely, 2^28057762457 is an apocalyptic number.

It is an amenable number.

28057762457 is a deficient number, since it is larger than the sum of its proper divisors (16007323).

28057762457 is a wasteful number, since it uses less digits than its factorization.

28057762457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16007322.

The product of its (nonzero) digits is 6585600, while the sum is 53.

The spelling of 28057762457 in words is "twenty-eight billion, fifty-seven million, seven hundred sixty-two thousand, four hundred fifty-seven".