28717510787 has 16 divisors (see below), whose sum is σ = 32894598912. Its totient is φ = 24559143840.

The previous prime is 28717510781. The next prime is 28717510819. The reversal of 28717510787 is 78701571782.

It is not a de Polignac number, because 28717510787 - 2⁴ = 28717510771 is a prime.

It is a super-2 number, since 2×28717510787² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28717510781) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6766088 + ... + 6770330.

It is an arithmetic number, because the mean of its divisors is an integer number (2055912432).

Almost surely, 2^28717510787 is an apocalyptic number.

28717510787 is a deficient number, since it is larger than the sum of its proper divisors (4177088125).

28717510787 is a wasteful number, since it uses less digits than its factorization.

28717510787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6218.

The product of its (nonzero) digits is 1536640, while the sum is 53.

The spelling of 28717510787 in words is "twenty-eight billion, seven hundred seventeen million, five hundred ten thousand, seven hundred eighty-seven".