2578878 has 20 divisors (see below), whose sum is σ = 5778960. Its totient is φ = 859572.

The previous prime is 2578861. The next prime is 2578879. The reversal of 2578878 is 8788752.

It is a happy number.

2578878 is a `hidden beast` number, since 2 + 578 + 8 + 78 = 666.

It is a super-2 number, since 2×2578878² = 13301223477768, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2578879) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 7798 + ... + 8121.

It is an arithmetic number, because the mean of its divisors is an integer number (288948).

2^2578878 is an apocalyptic number.

2578878 is an abundant number, since it is smaller than the sum of its proper divisors (3200082).

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

2578878 is a wasteful number, since it uses less digits than its factorization.

2578878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15933 (or 15924 counting only the distinct ones).

The product of its digits is 250880, while the sum is 45.

The square root of 2578878 is about 1605.8885390960. Note that the first 3 decimals coincide. The cubic root of 2578878 is about 137.1335121981.

The spelling of 2578878 in words is "two million, five hundred seventy-eight thousand, eight hundred seventy-eight".