2605976749 has 4 divisors (see below), whose sum is σ = 2743133440. Its totient is φ = 2468820060.

The previous prime is 2605976731. The next prime is 2605976753. The reversal of 2605976749 is 9476795062.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2605976749 - 2¹⁷ = 2605845677 is a prime.

It is a super-2 number, since 2×2605976749² = 13582229632657218002, 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 2605976749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2605971749) 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, 68578317 + ... + 68578354.

It is an arithmetic number, because the mean of its divisors is an integer number (685783360).

Almost surely, 2^2605976749 is an apocalyptic number.

It is an amenable number.

2605976749 is a deficient number, since it is larger than the sum of its proper divisors (137156691).

2605976749 is a wasteful number, since it uses less digits than its factorization.

2605976749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137156690.

The product of its (nonzero) digits is 5715360, while the sum is 55.

The square root of 2605976749 is about 51048.7683396965. The cubic root of 2605976749 is about 1376.1217070904.

The spelling of 2605976749 in words is "two billion, six hundred five million, nine hundred seventy-six thousand, seven hundred forty-nine".