28107686387 has 8 divisors (see below), whose sum is σ = 30688777152. Its totient is φ = 25530903400.

The previous prime is 28107686371. The next prime is 28107686401. The reversal of 28107686387 is 78368670182.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 28107686387 - 2⁴ = 28107686371 is a prime.

It is a super-2 number, since 2×28107686387² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28107686357) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1063289 + ... + 1089402.

It is an arithmetic number, because the mean of its divisors is an integer number (3836097144).

Almost surely, 2^28107686387 is an apocalyptic number.

28107686387 is a deficient number, since it is larger than the sum of its proper divisors (2581090765).

28107686387 is a wasteful number, since it uses less digits than its factorization.

28107686387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2153889.

The product of its (nonzero) digits is 5419008, while the sum is 56.

The spelling of 28107686387 in words is "twenty-eight billion, one hundred seven million, six hundred eighty-six thousand, three hundred eighty-seven".