2578420 has 48 divisors (see below), whose sum is σ = 5983488. Its totient is φ = 927360.

The previous prime is 2578417. The next prime is 2578423. The reversal of 2578420 is 248752.

It is an interprime number because it is at equal distance from previous prime (2578417) and next prime (2578423).

It is a Smith number, since the sum of its digits (28) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2578423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12115 + ... + 12325.

It is an arithmetic number, because the mean of its divisors is an integer number (124656).

2^2578420 is an apocalyptic number.

2578420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2578420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2991744).

2578420 is an abundant number, since it is smaller than the sum of its proper divisors (3405068).

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

2578420 is a wasteful number, since it uses less digits than its factorization.

2578420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280 (or 278 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 28.

The square root of 2578420 is about 1605.7459325809. The cubic root of 2578420 is about 137.1253935683.

The spelling of 2578420 in words is "two million, five hundred seventy-eight thousand, four hundred twenty".