2690138785 has 4 divisors (see below), whose sum is σ = 3228166548. Its totient is φ = 2152111024.

The previous prime is 2690138783. The next prime is 2690138821. The reversal of 2690138785 is 5878310962.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1556065809 + 1134072976 = 39447^2 + 33676^2 .

It is a cyclic number.

It is not a de Polignac number, because 2690138785 - 2¹ = 2690138783 is a prime.

It is a super-2 number, since 2×2690138785² = 14473693365122552450, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2690138783) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 269013874 + ... + 269013883.

It is an arithmetic number, because the mean of its divisors is an integer number (807041637).

Almost surely, 2^2690138785 is an apocalyptic number.

It is an amenable number.

2690138785 is a deficient number, since it is larger than the sum of its proper divisors (538027763).

2690138785 is an equidigital number, since it uses as much as digits as its factorization.

2690138785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 538027762.

The product of its (nonzero) digits is 725760, while the sum is 49.

The square root of 2690138785 is about 51866.5478415520. The cubic root of 2690138785 is about 1390.7793336838.

The spelling of 2690138785 in words is "two billion, six hundred ninety million, one hundred thirty-eight thousand, seven hundred eighty-five".