2640261 has 8 divisors (see below), whose sum is σ = 3791200. Its totient is φ = 1624752.

The previous prime is 2640251. The next prime is 2640271. The reversal of 2640261 is 1620462.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2640251) and next prime (2640271).

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

It is a de Polignac number, because none of the positive numbers 2^k-2640261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2640251) 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, 33811 + ... + 33888.

It is an arithmetic number, because the mean of its divisors is an integer number (473900).

2^2640261 is an apocalyptic number.

It is an amenable number.

2640261 is a deficient number, since it is larger than the sum of its proper divisors (1150939).

2640261 is a wasteful number, since it uses less digits than its factorization.

2640261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67715.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 2640261 is about 1624.8879961400. The cubic root of 2640261 is about 138.2130190473.

The spelling of 2640261 in words is "two million, six hundred forty thousand, two hundred sixty-one".