25427778 has 8 divisors (see below), whose sum is σ = 50855568. Its totient is φ = 8475924.

The previous prime is 25427771. The next prime is 25427803. The reversal of 25427778 is 87772452.

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

25427778 is an admirable number.

It is a super-3 number, since 3×25427778³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (25427771) 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, 2118976 + ... + 2118987.

It is an arithmetic number, because the mean of its divisors is an integer number (6356946).

Almost surely, 2^25427778 is an apocalyptic number.

25427778 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

25427778 is a wasteful number, since it uses less digits than its factorization.

25427778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4237968.

The product of its digits is 219520, while the sum is 42.

The square root of 25427778 is about 5042.5963550536. The cubic root of 25427778 is about 294.0601246833.

The spelling of 25427778 in words is "twenty-five million, four hundred twenty-seven thousand, seven hundred seventy-eight".