28320610405 has 8 divisors (see below), whose sum is σ = 34091941752. Its totient is φ = 22585015488.

The previous prime is 28320610343. The next prime is 28320610429. The reversal of 28320610405 is 50401602382.

It can be written as a sum of positive squares in 4 ways, for example, as 987593476 + 27333016929 = 31426^2 + 165327^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28320610405 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8932362 + ... + 8935531.

It is an arithmetic number, because the mean of its divisors is an integer number (4261492719).

Almost surely, 2^28320610405 is an apocalyptic number.

It is an amenable number.

28320610405 is a deficient number, since it is larger than the sum of its proper divisors (5771331347).

28320610405 is a wasteful number, since it uses less digits than its factorization.

28320610405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17868215.

The product of its (nonzero) digits is 11520, while the sum is 31.

The spelling of 28320610405 in words is "twenty-eight billion, three hundred twenty million, six hundred ten thousand, four hundred five".