28871431573 has 4 divisors (see below), whose sum is σ = 28944155980. Its totient is φ = 28798707168.

The previous prime is 28871431549. The next prime is 28871431669. The reversal of 28871431573 is 37513417882.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37513417882 = 2 ⋅18756708941.

It can be written as a sum of positive squares in 2 ways, for example, as 19508546929 + 9362884644 = 139673^2 + 96762^2 .

It is a cyclic number.

It is not a de Polignac number, because 28871431573 - 2²¹ = 28869334421 is a prime.

It is a super-2 number, since 2×28871431573² (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 (28871431073) 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, 36361608 + ... + 36362401.

It is an arithmetic number, because the mean of its divisors is an integer number (7236038995).

Almost surely, 2^28871431573 is an apocalyptic number.

It is an amenable number.

28871431573 is a deficient number, since it is larger than the sum of its proper divisors (72724407).

28871431573 is an equidigital number, since it uses as much as digits as its factorization.

28871431573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72724406.

The product of its digits is 1128960, while the sum is 49.

The spelling of 28871431573 in words is "twenty-eight billion, eight hundred seventy-one million, four hundred thirty-one thousand, five hundred seventy-three".