28650121643 has 24 divisors (see below), whose sum is σ = 34110590976. Its totient is φ = 23852556000.

The previous prime is 28650121639. The next prime is 28650121783. The reversal of 28650121643 is 34612105682.

It is not a de Polignac number, because 28650121643 - 2² = 28650121639 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28650121597 and 28650121606.

It is not an unprimeable number, because it can be changed into a prime (28650123643) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 175418 + ... + 296768.

It is an arithmetic number, because the mean of its divisors is an integer number (1421274624).

Almost surely, 2^28650121643 is an apocalyptic number.

28650121643 is a deficient number, since it is larger than the sum of its proper divisors (5460469333).

28650121643 is a wasteful number, since it uses less digits than its factorization.

28650121643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121515 (or 121502 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 38.

The spelling of 28650121643 in words is "twenty-eight billion, six hundred fifty million, one hundred twenty-one thousand, six hundred forty-three".