28687271607 has 20 divisors (see below), whose sum is σ = 43765614816. Its totient is φ = 18717933600.

The previous prime is 28687271603. The next prime is 28687271621. The reversal of 28687271607 is 70617278682.

It is a happy number.

28687271607 is a `hidden beast` number, since 2 + 8 + 6 + 8 + 7 + 27 + 1 + 607 = 666.

It is not a de Polignac number, because 28687271607 - 2² = 28687271603 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28687271603) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3763894 + ... + 3771507.

Almost surely, 2^28687271607 is an apocalyptic number.

28687271607 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

28687271607 is a deficient number, since it is larger than the sum of its proper divisors (15078343209).

28687271607 is an equidigital number, since it uses as much as digits as its factorization.

28687271607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7535460 (or 7535451 counting only the distinct ones).

The product of its (nonzero) digits is 3161088, while the sum is 54.

The spelling of 28687271607 in words is "twenty-eight billion, six hundred eighty-seven million, two hundred seventy-one thousand, six hundred seven".