28165047031 has 4 divisors (see below), whose sum is σ = 30725505864. Its totient is φ = 25604588200.

The previous prime is 28165047023. The next prime is 28165047059. The reversal of 28165047031 is 13074056182.

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

It is a cyclic number.

It is not a de Polignac number, because 28165047031 - 2³ = 28165047023 is a prime.

It is a super-2 number, since 2×28165047031² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28165047011) 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, 1280229400 + ... + 1280229421.

It is an arithmetic number, because the mean of its divisors is an integer number (7681376466).

Almost surely, 2^28165047031 is an apocalyptic number.

28165047031 is a deficient number, since it is larger than the sum of its proper divisors (2560458833).

28165047031 is a wasteful number, since it uses less digits than its factorization.

28165047031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2560458832.

The product of its (nonzero) digits is 40320, while the sum is 37.

The spelling of 28165047031 in words is "twenty-eight billion, one hundred sixty-five million, forty-seven thousand, thirty-one".