25280778 has 8 divisors (see below), whose sum is σ = 50561568. Its totient is φ = 8426924.

The previous prime is 25280767. The next prime is 25280789. The reversal of 25280778 is 87708252.

It is an interprime number because it is at equal distance from previous prime (25280767) and next prime (25280789).

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

25280778 is an admirable number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2106726 + ... + 2106737.

It is an arithmetic number, because the mean of its divisors is an integer number (6320196).

Almost surely, 2^25280778 is an apocalyptic number.

25280778 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.

25280778 is a wasteful number, since it uses less digits than its factorization.

25280778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4213468.

The product of its (nonzero) digits is 62720, while the sum is 39.

The square root of 25280778 is about 5027.9994033413. Note that the first 3 decimals coincide. The cubic root of 25280778 is about 293.4923675614.

The spelling of 25280778 in words is "twenty-five million, two hundred eighty thousand, seven hundred seventy-eight".