28749738623 has 4 divisors (see below), whose sum is σ = 28750080528. Its totient is φ = 28749396720.

The previous prime is 28749738593. The next prime is 28749738629. The reversal of 28749738623 is 32683794782.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 28749738623 - 2³⁴ = 11569869439 is a prime.

It is a super-2 number, since 2×28749738623² (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 (28749738629) 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, 52790 + ... + 245532.

It is an arithmetic number, because the mean of its divisors is an integer number (7187520132).

Almost surely, 2^28749738623 is an apocalyptic number.

28749738623 is a deficient number, since it is larger than the sum of its proper divisors (341905).

28749738623 is a wasteful number, since it uses less digits than its factorization.

28749738623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341904.

The product of its digits is 24385536, while the sum is 59.

The spelling of 28749738623 in words is "twenty-eight billion, seven hundred forty-nine million, seven hundred thirty-eight thousand, six hundred twenty-three".