28502513551 has 4 divisors (see below), whose sum is σ = 29421949504. Its totient is φ = 27583077600.

The previous prime is 28502513521. The next prime is 28502513587. The reversal of 28502513551 is 15531520582.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28502513551 - 2⁷ = 28502513423 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28502513551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28502513521) 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, 459717930 + ... + 459717991.

It is an arithmetic number, because the mean of its divisors is an integer number (7355487376).

Almost surely, 2^28502513551 is an apocalyptic number.

28502513551 is a deficient number, since it is larger than the sum of its proper divisors (919435953).

28502513551 is an equidigital number, since it uses as much as digits as its factorization.

28502513551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 919435952.

The product of its (nonzero) digits is 60000, while the sum is 37.

The spelling of 28502513551 in words is "twenty-eight billion, five hundred two million, five hundred thirteen thousand, five hundred fifty-one".