28312121366 has 4 divisors (see below), whose sum is σ = 42468182052. Its totient is φ = 14156060682.

The previous prime is 28312121359. The next prime is 28312121381. The reversal of 28312121366 is 66312121382.

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

It is a super-2 number, since 2×28312121366² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7078030340 + ... + 7078030343.

It is an arithmetic number, because the mean of its divisors is an integer number (10617045513).

Almost surely, 2^28312121366 is an apocalyptic number.

28312121366 is a deficient number, since it is larger than the sum of its proper divisors (14156060686).

28312121366 is a wasteful number, since it uses less digits than its factorization.

28312121366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14156060685.

The product of its digits is 20736, while the sum is 35.

The spelling of 28312121366 in words is "twenty-eight billion, three hundred twelve million, one hundred twenty-one thousand, three hundred sixty-six".