28528551557 has 8 divisors (see below), whose sum is σ = 31295924640. Its totient is φ = 25790156560.

The previous prime is 28528551523. The next prime is 28528551599. The reversal of 28528551557 is 75515582582.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28528551557 - 2⁸ = 28528551301 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28528551499 and 28528551508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28578551557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7242458 + ... + 7246395.

It is an arithmetic number, because the mean of its divisors is an integer number (3911990580).

Almost surely, 2^28528551557 is an apocalyptic number.

It is an amenable number.

28528551557 is a deficient number, since it is larger than the sum of its proper divisors (2767373083).

28528551557 is a wasteful number, since it uses less digits than its factorization.

28528551557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14489043.

The product of its digits is 5600000, while the sum is 53.

It can be divided in two parts, 28528 and 551557, that added together give a palindrome (580085).

The spelling of 28528551557 in words is "twenty-eight billion, five hundred twenty-eight million, five hundred fifty-one thousand, five hundred fifty-seven".