2660778 has 24 divisors (see below), whose sum is σ = 6016608. Its totient is φ = 848232.

The previous prime is 2660773. The next prime is 2660783. The reversal of 2660778 is 8770662.

It is an interprime number because it is at equal distance from previous prime (2660773) and next prime (2660783).

It is a plaindrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (2660773) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2800 + ... + 3627.

It is an arithmetic number, because the mean of its divisors is an integer number (250692).

2^2660778 is an apocalyptic number.

2660778 is an abundant number, since it is smaller than the sum of its proper divisors (3355830).

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

2660778 is a wasteful number, since it uses less digits than its factorization.

2660778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6458 (or 6455 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

The square root of 2660778 is about 1631.1891367956. The cubic root of 2660778 is about 138.5701053070.

It can be divided in two parts, 266077 and 8, that added together give a triangular number (266085 = T₇₂₉).

The spelling of 2660778 in words is "two million, six hundred sixty thousand, seven hundred seventy-eight".