2689688493 has 6 divisors (see below), whose sum is σ = 3885105614. Its totient is φ = 1793125656.

The previous prime is 2689688461. The next prime is 2689688497. The reversal of 2689688493 is 3948869862.

2689688493 is a `hidden beast` number, since 2 + 6 + 89 + 68 + 8 + 493 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1456414569 + 1233273924 = 38163^2 + 35118^2 .

It is not a de Polignac number, because 2689688493 - 2⁵ = 2689688461 is a prime.

It is a super-2 number, since 2×2689688493² = 14468848378753222098, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2689688493.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2689688497) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 149427130 + ... + 149427147.

Almost surely, 2^2689688493 is an apocalyptic number.

It is an amenable number.

2689688493 is a deficient number, since it is larger than the sum of its proper divisors (1195417121).

2689688493 is a wasteful number, since it uses less digits than its factorization.

2689688493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298854283 (or 298854280 counting only the distinct ones).

The product of its digits is 35831808, while the sum is 63.

The square root of 2689688493 is about 51862.2067887590. The cubic root of 2689688493 is about 1390.7017302832.

The spelling of 2689688493 in words is "two billion, six hundred eighty-nine million, six hundred eighty-eight thousand, four hundred ninety-three".