2791640405 has 8 divisors (see below), whose sum is σ = 3351699000. Its totient is φ = 2232158656.

The previous prime is 2791640399. The next prime is 2791640407. The reversal of 2791640405 is 5040461972.

It can be written as a sum of positive squares in 4 ways, for example, as 104980516 + 2686659889 = 10246^2 + 51833^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2791640405 - 2²⁶ = 2724531541 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2791640407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 133490 + ... + 152979.

It is an arithmetic number, because the mean of its divisors is an integer number (418962375).

Almost surely, 2^2791640405 is an apocalyptic number.

It is an amenable number.

2791640405 is a deficient number, since it is larger than the sum of its proper divisors (560058595).

2791640405 is a wasteful number, since it uses less digits than its factorization.

2791640405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288423.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 2791640405 is about 52835.9764270521. The cubic root of 2791640405 is about 1408.0556680827.

The spelling of 2791640405 in words is "two billion, seven hundred ninety-one million, six hundred forty thousand, four hundred five".