2690185690 has 8 divisors (see below), whose sum is σ = 4842334260. Its totient is φ = 1076074272.

The previous prime is 2690185643. The next prime is 2690185703. The reversal of 2690185690 is 965810962.

2690185690 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Cunningham number, because it is equal to 51867²+1.

It can be written as a sum of positive squares in 2 ways, for example, as 2690185689 + 1 = 51867^2 + 1^2 .

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

It is a super-2 number, since 2×2690185690² = 14474198093361552200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2690185690.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134509275 + ... + 134509294.

Almost surely, 2^2690185690 is an apocalyptic number.

2690185690 is a deficient number, since it is larger than the sum of its proper divisors (2152148570).

2690185690 is a wasteful number, since it uses less digits than its factorization.

2690185690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269018576.

The product of its (nonzero) digits is 233280, while the sum is 46.

The square root of 2690185690 is about 51867.0000096400. Note that the first 5 decimals coincide. The cubic root of 2690185690 is about 1390.7874168015.

The spelling of 2690185690 in words is "two billion, six hundred ninety million, one hundred eighty-five thousand, six hundred ninety".