26401660 has 24 divisors (see below), whose sum is σ = 55848240. Its totient is φ = 10483584.

The previous prime is 26401651. The next prime is 26401667. The reversal of 26401660 is 6610462.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26401667) 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, 1969 + ... + 7528.

It is an arithmetic number, because the mean of its divisors is an integer number (2327010).

Almost surely, 2^26401660 is an apocalyptic number.

26401660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26401660 is an abundant number, since it is smaller than the sum of its proper divisors (29446580).

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

26401660 is a wasteful number, since it uses less digits than its factorization.

26401660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9645 (or 9643 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 26401660 is about 5138.2545674577. The cubic root of 26401660 is about 297.7673514125.

The spelling of 26401660 in words is "twenty-six million, four hundred one thousand, six hundred sixty".