2691240765 has 16 divisors (see below), whose sum is σ = 4330879488. Its totient is φ = 1427030336.

The previous prime is 2691240757. The next prime is 2691240817. The reversal of 2691240765 is 5670421962.

It is a cyclic number.

It is not a de Polignac number, because 2691240765 - 2³ = 2691240757 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 515949 + ... + 521138.

It is an arithmetic number, because the mean of its divisors is an integer number (270679968).

Almost surely, 2^2691240765 is an apocalyptic number.

It is an amenable number.

2691240765 is a deficient number, since it is larger than the sum of its proper divisors (1639638723).

2691240765 is a wasteful number, since it uses less digits than its factorization.

2691240765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1037268.

The product of its (nonzero) digits is 181440, while the sum is 42.

The square root of 2691240765 is about 51877.1699787103. The cubic root of 2691240765 is about 1390.9692125846.

The spelling of 2691240765 in words is "two billion, six hundred ninety-one million, two hundred forty thousand, seven hundred sixty-five".