2639012765 has 32 divisors (see below), whose sum is σ = 3444475104. Its totient is φ = 1933148160.

The previous prime is 2639012741. The next prime is 2639012767. The reversal of 2639012765 is 5672109362.

2639012765 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 16 ways, for example, as 576672196 + 2062340569 = 24014^2 + 45413^2 .

It is not a de Polignac number, because 2639012765 - 2¹⁶ = 2638947229 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2639012767) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1591817 + ... + 1593473.

It is an arithmetic number, because the mean of its divisors is an integer number (107639847).

Almost surely, 2^2639012765 is an apocalyptic number.

It is an amenable number.

2639012765 is a deficient number, since it is larger than the sum of its proper divisors (805462339).

2639012765 is a wasteful number, since it uses less digits than its factorization.

2639012765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2177.

The product of its (nonzero) digits is 136080, while the sum is 41.

The square root of 2639012765 is about 51371.3223987859. The cubic root of 2639012765 is about 1381.9123464505.

The spelling of 2639012765 in words is "two billion, six hundred thirty-nine million, twelve thousand, seven hundred sixty-five".