28271199957 has 32 divisors (see below), whose sum is σ = 50611384320. Its totient is φ = 13556617920.

The previous prime is 28271199947. The next prime is 28271199973. The reversal of 28271199957 is 75999117282.

It is a happy number.

It is not a de Polignac number, because 28271199957 - 2⁷ = 28271199829 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28271199957.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28271199917) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4704157 + ... + 4710162.

It is an arithmetic number, because the mean of its divisors is an integer number (1581605760).

Almost surely, 2^28271199957 is an apocalyptic number.

It is an amenable number.

28271199957 is a deficient number, since it is larger than the sum of its proper divisors (22340184363).

28271199957 is a wasteful number, since it uses less digits than its factorization.

28271199957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9414353.

The product of its digits is 5715360, while the sum is 60.

The spelling of 28271199957 in words is "twenty-eight billion, two hundred seventy-one million, one hundred ninety-nine thousand, nine hundred fifty-seven".