25778164 has 6 divisors (see below), whose sum is σ = 45111794. Its totient is φ = 12889080.

The previous prime is 25778161. The next prime is 25778167. The reversal of 25778164 is 46187752.

It is an interprime number because it is at equal distance from previous prime (25778161) and next prime (25778167).

It can be written as a sum of positive squares in only one way, i.e., 15665764 + 10112400 = 3958^2 + 3180^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25778161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3222267 + ... + 3222274.

Almost surely, 2^25778164 is an apocalyptic number.

It is an amenable number.

25778164 is a deficient number, since it is larger than the sum of its proper divisors (19333630).

25778164 is a wasteful number, since it uses less digits than its factorization.

25778164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6444545 (or 6444543 counting only the distinct ones).

The product of its digits is 94080, while the sum is 40.

The square root of 25778164 is about 5077.2201055302. The cubic root of 25778164 is about 295.4046500904.

The spelling of 25778164 in words is "twenty-five million, seven hundred seventy-eight thousand, one hundred sixty-four".