28036987665 has 32 divisors (see below), whose sum is σ = 45486372096. Its totient is φ = 14745446400.

The previous prime is 28036987663. The next prime is 28036987697. The reversal of 28036987665 is 56678963082.

It is a happy number.

It is not a de Polignac number, because 28036987665 - 2¹ = 28036987663 is a prime.

It is a super-3 number, since 3×28036987665³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28036987599 and 28036987608.

It is not an unprimeable number, because it can be changed into a prime (28036987663) 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, 265129 + ... + 355481.

It is an arithmetic number, because the mean of its divisors is an integer number (1421449128).

Almost surely, 2^28036987665 is an apocalyptic number.

It is an amenable number.

28036987665 is a deficient number, since it is larger than the sum of its proper divisors (17449384431).

28036987665 is a wasteful number, since it uses less digits than its factorization.

28036987665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90649.

The product of its (nonzero) digits is 26127360, while the sum is 60.

The spelling of 28036987665 in words is "twenty-eight billion, thirty-six million, nine hundred eighty-seven thousand, six hundred sixty-five".