28620614861 has 4 divisors (see below), whose sum is σ = 28621806012. Its totient is φ = 28619423712.

The previous prime is 28620614851. The next prime is 28620614863. The reversal of 28620614861 is 16841602682.

It is a happy number.

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 3017414761 + 25603200100 = 54931^2 + 160010^2 .

It is a cyclic number.

It is not a de Polignac number, because 28620614861 - 2²⁶ = 28553505997 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 (28620614863) 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, 558776 + ... + 607841.

It is an arithmetic number, because the mean of its divisors is an integer number (7155451503).

Almost surely, 2^28620614861 is an apocalyptic number.

It is an amenable number.

28620614861 is a deficient number, since it is larger than the sum of its proper divisors (1191151).

28620614861 is a wasteful number, since it uses less digits than its factorization.

28620614861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1191150.

The product of its (nonzero) digits is 221184, while the sum is 44.

The spelling of 28620614861 in words is "twenty-eight billion, six hundred twenty million, six hundred fourteen thousand, eight hundred sixty-one".