28351392331 has 4 divisors (see below), whose sum is σ = 28353323152. Its totient is φ = 28349461512.

The previous prime is 28351392323. The next prime is 28351392347. The reversal of 28351392331 is 13329315382.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13329315382 = 2 ⋅6664657691.

It is a cyclic number.

It is not a de Polignac number, because 28351392331 - 2³ = 28351392323 is a prime.

It is a super-2 number, since 2×28351392331² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28351393331) 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, 943215 + ... + 972808.

It is an arithmetic number, because the mean of its divisors is an integer number (7088330788).

Almost surely, 2^28351392331 is an apocalyptic number.

28351392331 is a deficient number, since it is larger than the sum of its proper divisors (1930821).

28351392331 is a wasteful number, since it uses less digits than its factorization.

28351392331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1930820.

The product of its digits is 116640, while the sum is 40.

The spelling of 28351392331 in words is "twenty-eight billion, three hundred fifty-one million, three hundred ninety-two thousand, three hundred thirty-one".