2640078 has 48 divisors (see below), whose sum is σ = 6829056. Its totient is φ = 720720.

The previous prime is 2640067. The next prime is 2640137. The reversal of 2640078 is 8700462.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2443 + ... + 3353.

It is an arithmetic number, because the mean of its divisors is an integer number (142272).

2^2640078 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2640078, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3414528).

2640078 is an abundant number, since it is smaller than the sum of its proper divisors (4188978).

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

2640078 is a wasteful number, since it uses less digits than its factorization.

2640078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 949 (or 946 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 2640078 is about 1624.8316835906. The cubic root of 2640078 is about 138.2098257308.

It can be divided in two parts, 26 and 40078, that added together give a palindrome (40104).

The spelling of 2640078 in words is "two million, six hundred forty thousand, seventy-eight".