2661870 has 16 divisors (see below), whose sum is σ = 6388560. Its totient is φ = 709824.

The previous prime is 2661863. The next prime is 2661871. The reversal of 2661870 is 781662.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 88729 = 2661870 / (2 + 6 + 6 + 1 + 8 + 7 + 0).

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2661871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44335 + ... + 44394.

It is an arithmetic number, because the mean of its divisors is an integer number (399285).

2^2661870 is an apocalyptic number.

2661870 is an abundant number, since it is smaller than the sum of its proper divisors (3726690).

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

2661870 is a wasteful number, since it uses less digits than its factorization.

2661870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88739.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 2661870 is about 1631.5238275919. The cubic root of 2661870 is about 138.5890593947.

The spelling of 2661870 in words is "two million, six hundred sixty-one thousand, eight hundred seventy".