28193777943 has 16 divisors (see below), whose sum is σ = 37862592000. Its totient is φ = 18660801024.

The previous prime is 28193777939. The next prime is 28193777957. The reversal of 28193777943 is 34977739182.

It is not a de Polignac number, because 28193777943 - 2² = 28193777939 is a prime.

It is a super-2 number, since 2×28193777943² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28193777903) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 240130 + ... + 337712.

It is an arithmetic number, because the mean of its divisors is an integer number (2366412000).

Almost surely, 2^28193777943 is an apocalyptic number.

28193777943 is a deficient number, since it is larger than the sum of its proper divisors (9668814057).

28193777943 is a wasteful number, since it uses less digits than its factorization.

28193777943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98278.

The product of its digits is 16003008, while the sum is 60.

The spelling of 28193777943 in words is "twenty-eight billion, one hundred ninety-three million, seven hundred seventy-seven thousand, nine hundred forty-three".