26401980 has 96 divisors (see below), whose sum is σ = 81607680. Its totient is φ = 6324480.

The previous prime is 26401943. The next prime is 26401981. The reversal of 26401980 is 8910462.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26401981) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 71757 + ... + 72123.

It is an arithmetic number, because the mean of its divisors is an integer number (850080).

Almost surely, 2^26401980 is an apocalyptic number.

26401980 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 26401980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40803840).

26401980 is an abundant number, since it is smaller than the sum of its proper divisors (55205700).

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

26401980 is a wasteful number, since it uses less digits than its factorization.

26401980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499 (or 497 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 26401980 is about 5138.2857063421. The cubic root of 26401980 is about 297.7685544324.

The spelling of 26401980 in words is "twenty-six million, four hundred one thousand, nine hundred eighty".