2640651026 has 12 divisors (see below), whose sum is σ = 4289105322. Its totient is φ = 1218761856.

The previous prime is 2640651017. The next prime is 2640651029. The reversal of 2640651026 is 6201560462.

It can be written as a sum of positive squares in 3 ways, for example, as 646939225 + 1993711801 = 25435^2 + 44651^2 .

It is a super-2 number, since 2×2640651026² = 13946075682229705352, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2640650983 and 2640651001.

It is not an unprimeable number, because it can be changed into a prime (2640651029) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3905951 + ... + 3906626.

Almost surely, 2^2640651026 is an apocalyptic number.

2640651026 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

2640651026 is a deficient number, since it is larger than the sum of its proper divisors (1648454296).

2640651026 is a wasteful number, since it uses less digits than its factorization.

2640651026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7812605 (or 7812592 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 2640651026 is about 51387.2652123072. The cubic root of 2640651026 is about 1382.1982443718.

The spelling of 2640651026 in words is "two billion, six hundred forty million, six hundred fifty-one thousand, twenty-six".