28121650757 has 4 divisors (see below), whose sum is σ = 28180360320. Its totient is φ = 28062941196.

The previous prime is 28121650729. The next prime is 28121650763. The reversal of 28121650757 is 75705612182.

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 28121650757 - 2¹⁰ = 28121649733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28121650717) 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, 29354063 + ... + 29355020.

It is an arithmetic number, because the mean of its divisors is an integer number (7045090080).

Almost surely, 2^28121650757 is an apocalyptic number.

It is an amenable number.

28121650757 is a deficient number, since it is larger than the sum of its proper divisors (58709563).

28121650757 is an equidigital number, since it uses as much as digits as its factorization.

28121650757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58709562.

The product of its (nonzero) digits is 235200, while the sum is 44.

The spelling of 28121650757 in words is "twenty-eight billion, one hundred twenty-one million, six hundred fifty thousand, seven hundred fifty-seven".