28108661725 has 24 divisors (see below), whose sum is σ = 35338800672. Its totient is φ = 22175620800.

The previous prime is 28108661723. The next prime is 28108661743. The reversal of 28108661725 is 52716680182.

It is not a de Polignac number, because 28108661725 - 2¹ = 28108661723 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28108661723) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1156195 + ... + 1180255.

It is an arithmetic number, because the mean of its divisors is an integer number (1472450028).

Almost surely, 2^28108661725 is an apocalyptic number.

28108661725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28108661725 is a deficient number, since it is larger than the sum of its proper divisors (7230138947).

28108661725 is a wasteful number, since it uses less digits than its factorization.

28108661725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24717 (or 24712 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 46.

The spelling of 28108661725 in words is "twenty-eight billion, one hundred eight million, six hundred sixty-one thousand, seven hundred twenty-five".