2661864 has 32 divisors (see below), whose sum is σ = 6700320. Its totient is φ = 881216.

The previous prime is 2661863. The next prime is 2661871. The reversal of 2661864 is 4681662.

It is a happy number.

2661864 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (2661863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4447 + ... + 5009.

It is an arithmetic number, because the mean of its divisors is an integer number (209385).

2^2661864 is an apocalyptic number.

2661864 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

2661864 is an abundant number, since it is smaller than the sum of its proper divisors (4038456).

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

2661864 is a wasteful number, since it uses less digits than its factorization.

2661864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 769 (or 765 counting only the distinct ones).

The product of its digits is 13824, while the sum is 33.

The square root of 2661864 is about 1631.5219888190. The cubic root of 2661864 is about 138.5889552656.

The spelling of 2661864 in words is "two million, six hundred sixty-one thousand, eight hundred sixty-four".