2640299929 has 4 divisors (see below), whose sum is σ = 2657117284. Its totient is φ = 2623482576.

The previous prime is 2640299923. The next prime is 2640299951. The reversal of 2640299929 is 9299920462.

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 1836293904 + 804006025 = 42852^2 + 28355^2 .

It is a cyclic number.

It is not a de Polignac number, because 2640299929 - 2¹⁷ = 2640168857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2640299923) 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, 8408442 + ... + 8408755.

It is an arithmetic number, because the mean of its divisors is an integer number (664279321).

Almost surely, 2^2640299929 is an apocalyptic number.

It is an amenable number.

2640299929 is a deficient number, since it is larger than the sum of its proper divisors (16817355).

2640299929 is a wasteful number, since it uses less digits than its factorization.

2640299929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16817354.

The product of its (nonzero) digits is 1259712, while the sum is 52.

The square root of 2640299929 is about 51383.8489118906. The cubic root of 2640299929 is about 1382.1369833215.

It can be divided in two parts, 264029992 and 9, that added together give a square (264030001 = 16249²).

The spelling of 2640299929 in words is "two billion, six hundred forty million, two hundred ninety-nine thousand, nine hundred twenty-nine".