2878638 has 16 divisors (see below), whose sum is σ = 6579840. Its totient is φ = 822456.

The previous prime is 2878613. The next prime is 2878639. The reversal of 2878638 is 8368782.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 68539 = 2878638 / (2 + 8 + 7 + 8 + 6 + 3 + 8).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2878638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2878639) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34228 + ... + 34311.

It is an arithmetic number, because the mean of its divisors is an integer number (411240).

2^2878638 is an apocalyptic number.

2878638 is an abundant number, since it is smaller than the sum of its proper divisors (3701202).

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

2878638 is a wasteful number, since it uses less digits than its factorization.

2878638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68551.

The product of its digits is 129024, while the sum is 42.

The square root of 2878638 is about 1696.6549442948. The cubic root of 2878638 is about 142.2533004548.

The spelling of 2878638 in words is "two million, eight hundred seventy-eight thousand, six hundred thirty-eight".