28306860686 has 64 divisors (see below), whose sum is σ = 47111936256. Its totient is φ = 12676435200.

The previous prime is 28306860661. The next prime is 28306860689. The reversal of 28306860686 is 68606860382.

It is a super-2 number, since 2×28306860686² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28306860689) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 37196546 + ... + 37197306.

It is an arithmetic number, because the mean of its divisors is an integer number (736124004).

Almost surely, 2^28306860686 is an apocalyptic number.

28306860686 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

28306860686 is a deficient number, since it is larger than the sum of its proper divisors (18805075570).

28306860686 is a wasteful number, since it uses less digits than its factorization.

28306860686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1137.

The product of its (nonzero) digits is 3981312, while the sum is 53.

The spelling of 28306860686 in words is "twenty-eight billion, three hundred six million, eight hundred sixty thousand, six hundred eighty-six".