25720164 has 36 divisors (see below), whose sum is σ = 67843776. Its totient is φ = 8200368.

The previous prime is 25720159. The next prime is 25720169. The reversal of 25720164 is 46102752.

It is an interprime number because it is at equal distance from previous prime (25720159) and next prime (25720169).

It is a tau number, because it is divible by the number of its divisors (36).

It is a nialpdrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (25720169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14704 + ... + 16359.

Almost surely, 2^25720164 is an apocalyptic number.

It is an amenable number.

25720164 is an abundant number, since it is smaller than the sum of its proper divisors (42123612).

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

25720164 is a wasteful number, since it uses less digits than its factorization.

25720164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31096 (or 31091 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 25720164 is about 5071.5051020382. The cubic root of 25720164 is about 295.1829335541.

The spelling of 25720164 in words is "twenty-five million, seven hundred twenty thousand, one hundred sixty-four".