28742609725 has 12 divisors (see below), whose sum is σ = 36172790944. Its totient is φ = 22650891120.

The previous prime is 28742609629. The next prime is 28742609771. The reversal of 28742609725 is 52790624782.

It is not a de Polignac number, because 28742609725 - 2⁹ = 28742609213 is a prime.

It is a super-2 number, since 2×28742609725² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 8578209 + ... + 8581558.

Almost surely, 2^28742609725 is an apocalyptic number.

28742609725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28742609725 is a deficient number, since it is larger than the sum of its proper divisors (7430181219).

28742609725 is a wasteful number, since it uses less digits than its factorization.

28742609725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17159844 (or 17159839 counting only the distinct ones).

The product of its (nonzero) digits is 3386880, while the sum is 52.

The spelling of 28742609725 in words is "twenty-eight billion, seven hundred forty-two million, six hundred nine thousand, seven hundred twenty-five".