2661278 has 8 divisors (see below), whose sum is σ = 4037040. Its totient is φ = 1315600.

The previous prime is 2661271. The next prime is 2661283. The reversal of 2661278 is 8721662.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2661271) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7298 + ... + 7653.

It is an arithmetic number, because the mean of its divisors is an integer number (504630).

2^2661278 is an apocalyptic number.

2661278 is a deficient number, since it is larger than the sum of its proper divisors (1375762).

2661278 is a wasteful number, since it uses less digits than its factorization.

2661278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15042.

The product of its digits is 8064, while the sum is 32.

The square root of 2661278 is about 1631.3423920195. The cubic root of 2661278 is about 138.5787845621.

It can be divided in two parts, 266127 and 8, that multiplied together give a triangular number (2129016 = T₂₀₆₃).

The spelling of 2661278 in words is "two million, six hundred sixty-one thousand, two hundred seventy-eight".