25578220 has 12 divisors (see below), whose sum is σ = 53714304. Its totient is φ = 10231280.

The previous prime is 25578191. The next prime is 25578227. The reversal of 25578220 is 2287552.

It is not an unprimeable number, because it can be changed into a prime (25578227) 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, 639436 + ... + 639475.

It is an arithmetic number, because the mean of its divisors is an integer number (4476192).

Almost surely, 2^25578220 is an apocalyptic number.

25578220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25578220 is an abundant number, since it is smaller than the sum of its proper divisors (28136084).

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

25578220 is a wasteful number, since it uses less digits than its factorization.

25578220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1278920 (or 1278918 counting only the distinct ones).

The product of its (nonzero) digits is 11200, while the sum is 31.

The square root of 25578220 is about 5057.4914730526. The cubic root of 25578220 is about 294.6389147122.

The spelling of 25578220 in words is "twenty-five million, five hundred seventy-eight thousand, two hundred twenty".