2640618 has 12 divisors (see below), whose sum is σ = 5721378. Its totient is φ = 880200.

The previous prime is 2640581. The next prime is 2640643. The reversal of 2640618 is 8160462.

2640618 is a `hidden beast` number, since 2 + 6 + 40 + 618 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1979649 + 660969 = 1407^2 + 813^2 .

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a zygodrome in base 5.

It is a junction number, because it is equal to n+sod(n) for n = 2640591 and 2640600.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 73333 + ... + 73368.

2^2640618 is an apocalyptic number.

2640618 is an abundant number, since it is smaller than the sum of its proper divisors (3080760).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2640618 is a wasteful number, since it uses less digits than its factorization.

2640618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146709 (or 146706 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 2640618 is about 1624.9978461524. The cubic root of 2640618 is about 138.2192482072.

The spelling of 2640618 in words is "two million, six hundred forty thousand, six hundred eighteen".