28642862405 has 4 divisors (see below), whose sum is σ = 34371434892. Its totient is φ = 22914289920.

The previous prime is 28642862401. The next prime is 28642862407. The reversal of 28642862405 is 50426824682.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6650565601 + 21992296804 = 81551^2 + 148298^2 .

It is not a de Polignac number, because 28642862405 - 2² = 28642862401 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28642862405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28642862401) 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, 2864286236 + ... + 2864286245.

It is an arithmetic number, because the mean of its divisors is an integer number (8592858723).

Almost surely, 2^28642862405 is an apocalyptic number.

It is an amenable number.

28642862405 is a deficient number, since it is larger than the sum of its proper divisors (5728572487).

28642862405 is an equidigital number, since it uses as much as digits as its factorization.

28642862405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5728572486.

The product of its (nonzero) digits is 1474560, while the sum is 47.

The spelling of 28642862405 in words is "twenty-eight billion, six hundred forty-two million, eight hundred sixty-two thousand, four hundred five".