28657219497 has 4 divisors (see below), whose sum is σ = 38209626000. Its totient is φ = 19104812996.

The previous prime is 28657219477. The next prime is 28657219501. The reversal of 28657219497 is 79491275682.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28657219497 - 2¹⁸ = 28656957353 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28657219497.

It is not an unprimeable number, because it can be changed into a prime (28657219457) 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, 4776203247 + ... + 4776203252.

It is an arithmetic number, because the mean of its divisors is an integer number (9552406500).

Almost surely, 2^28657219497 is an apocalyptic number.

It is an amenable number.

28657219497 is a deficient number, since it is larger than the sum of its proper divisors (9552406503).

28657219497 is an equidigital number, since it uses as much as digits as its factorization.

28657219497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9552406502.

The product of its digits is 15240960, while the sum is 60.

The spelling of 28657219497 in words is "twenty-eight billion, six hundred fifty-seven million, two hundred nineteen thousand, four hundred ninety-seven".