25778417 has 16 divisors (see below), whose sum is σ = 30390912. Its totient is φ = 21409920.

The previous prime is 25778413. The next prime is 25778449. The reversal of 25778417 is 71487752.

It is not a de Polignac number, because 25778417 - 2² = 25778413 is a prime.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25778413) 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, 30758 + ... + 31584.

It is an arithmetic number, because the mean of its divisors is an integer number (1899432).

Almost surely, 2^25778417 is an apocalyptic number.

It is an amenable number.

25778417 is a deficient number, since it is larger than the sum of its proper divisors (4612495).

25778417 is an equidigital number, since it uses as much as digits as its factorization.

25778417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 968.

The product of its digits is 109760, while the sum is 41.

The square root of 25778417 is about 5077.2450206780. The cubic root of 25778417 is about 295.4056165043.

The spelling of 25778417 in words is "twenty-five million, seven hundred seventy-eight thousand, four hundred seventeen".