26129920 has 80 divisors (see below), whose sum is σ = 64080720. Its totient is φ = 10215424.

The previous prime is 26129911. The next prime is 26129923. The reversal of 26129920 is 2992162.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26129923) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 150954 + ... + 151126.

It is an arithmetic number, because the mean of its divisors is an integer number (801009).

Almost surely, 2^26129920 is an apocalyptic number.

26129920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26129920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32040360).

26129920 is an abundant number, since it is smaller than the sum of its proper divisors (37950800).

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

26129920 is an equidigital number, since it uses as much as digits as its factorization.

26129920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255 (or 239 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 26129920 is about 5111.7433425398. The cubic root of 26129920 is about 296.7422327107.

The spelling of 26129920 in words is "twenty-six million, one hundred twenty-nine thousand, nine hundred twenty".