28385258630557 has 4 divisors (see below), whose sum is σ = 28394838538560. Its totient is φ = 28375678722556.

The previous prime is 28385258630551. The next prime is 28385258630569. The reversal of 28385258630557 is 75503685258382.

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 28385258630557 - 2²⁷ = 28385124412829 is a prime.

It is a super-3 number, since 3×28385258630557³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28385258630492 and 28385258630501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28385258630551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4789949557 + ... + 4789955482.

It is an arithmetic number, because the mean of its divisors is an integer number (7098709634640).

Almost surely, 2^{28385258630557} is an apocalyptic number.

It is an amenable number.

28385258630557 is a deficient number, since it is larger than the sum of its proper divisors (9579908003).

28385258630557 is an equidigital number, since it uses as much as digits as its factorization.

28385258630557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9579908002.

The product of its (nonzero) digits is 483840000, while the sum is 67.

The spelling of 28385258630557 in words is "twenty-eight trillion, three hundred eighty-five billion, two hundred fifty-eight million, six hundred thirty thousand, five hundred fifty-seven".