2640438958 has 4 divisors (see below), whose sum is σ = 3960658440. Its totient is φ = 1320219478.

The previous prime is 2640438947. The next prime is 2640438961. The reversal of 2640438958 is 8598340462.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8598340462 = 2 ⋅4299170231.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660109738 + ... + 660109741.

It is an arithmetic number, because the mean of its divisors is an integer number (990164610).

Almost surely, 2^2640438958 is an apocalyptic number.

2640438958 is a deficient number, since it is larger than the sum of its proper divisors (1320219482).

2640438958 is a wasteful number, since it uses less digits than its factorization.

2640438958 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1320219481.

The product of its (nonzero) digits is 1658880, while the sum is 49.

The square root of 2640438958 is about 51385.2017413574. The cubic root of 2640438958 is about 1382.1612424026.

The spelling of 2640438958 in words is "two billion, six hundred forty million, four hundred thirty-eight thousand, nine hundred fifty-eight".