2640657047 has 8 divisors (see below), whose sum is σ = 3088077696. Its totient is φ = 2210782392.

The previous prime is 2640657043. The next prime is 2640657049. The reversal of 2640657047 is 7407560462.

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

It is not a de Polignac number, because 2640657047 - 2² = 2640657043 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2640656995 and 2640657013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2640657043) 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, 4386173 + ... + 4386774.

It is an arithmetic number, because the mean of its divisors is an integer number (386009712).

Almost surely, 2^2640657047 is an apocalyptic number.

2640657047 is a deficient number, since it is larger than the sum of its proper divisors (447420649).

2640657047 is an equidigital number, since it uses as much as digits as its factorization.

2640657047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8772997.

The product of its (nonzero) digits is 282240, while the sum is 41.

The square root of 2640657047 is about 51387.3237968276. The cubic root of 2640657047 is about 1382.1992948968.

The spelling of 2640657047 in words is "two billion, six hundred forty million, six hundred fifty-seven thousand, forty-seven".