2640878 has 8 divisors (see below), whose sum is σ = 3978480. Its totient is φ = 1314720.

The previous prime is 2640871. The next prime is 2640881. The reversal of 2640878 is 8780462.

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

It is a super-2 number, since 2×2640878² = 13948473221768, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2640871) 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, 2258 + ... + 3221.

It is an arithmetic number, because the mean of its divisors is an integer number (497310).

2^2640878 is an apocalyptic number.

2640878 is a deficient number, since it is larger than the sum of its proper divisors (1337602).

2640878 is a wasteful number, since it uses less digits than its factorization.

2640878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5722.

The product of its (nonzero) digits is 21504, while the sum is 35.

The square root of 2640878 is about 1625.0778442893. The cubic root of 2640878 is about 138.2237844969.

It can be divided in two parts, 26 and 40878, that added together give a palindrome (40904).

The spelling of 2640878 in words is "two million, six hundred forty thousand, eight hundred seventy-eight".