28465937531 has 4 divisors (see below), whose sum is σ = 29235287232. Its totient is φ = 27696587832.

The previous prime is 28465937509. The next prime is 28465937551. The reversal of 28465937531 is 13573956482.

It is a happy number.

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 28465937531 - 2¹⁴ = 28465921147 is a prime.

It is a super-2 number, since 2×28465937531² (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 (28465937551) 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, 384674795 + ... + 384674868.

It is an arithmetic number, because the mean of its divisors is an integer number (7308821808).

Almost surely, 2^28465937531 is an apocalyptic number.

28465937531 is a deficient number, since it is larger than the sum of its proper divisors (769349701).

28465937531 is an equidigital number, since it uses as much as digits as its factorization.

28465937531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 769349700.

The product of its digits is 5443200, while the sum is 53.

The spelling of 28465937531 in words is "twenty-eight billion, four hundred sixty-five million, nine hundred thirty-seven thousand, five hundred thirty-one".