28735408623 has 4 divisors (see below), whose sum is σ = 38313878168. Its totient is φ = 19156939080.

The previous prime is 28735408621. The next prime is 28735408627. The reversal of 28735408623 is 32680453782.

It is a happy number.

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

It is not a de Polignac number, because 28735408623 - 2¹ = 28735408621 is a prime.

It is a super-2 number, since 2×28735408623² (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 (28735408621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4789234768 + ... + 4789234773.

It is an arithmetic number, because the mean of its divisors is an integer number (9578469542).

Almost surely, 2^28735408623 is an apocalyptic number.

28735408623 is a deficient number, since it is larger than the sum of its proper divisors (9578469545).

28735408623 is an equidigital number, since it uses as much as digits as its factorization.

28735408623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9578469544.

The product of its (nonzero) digits is 1935360, while the sum is 48.

The spelling of 28735408623 in words is "twenty-eight billion, seven hundred thirty-five million, four hundred eight thousand, six hundred twenty-three".