26478489680 has 80 divisors (see below), whose sum is σ = 65531073600. Its totient is φ = 9921162240.

The previous prime is 26478489659. The next prime is 26478489703. The reversal of 26478489680 is 8698487462.

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

It is a super-2 number, since 2×26478489680² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37415 + ... + 233145.

It is an arithmetic number, because the mean of its divisors is an integer number (819138420).

Almost surely, 2^26478489680 is an apocalyptic number.

26478489680 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 26478489680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32765536800).

26478489680 is an abundant number, since it is smaller than the sum of its proper divisors (39052583920).

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

26478489680 is a wasteful number, since it uses less digits than its factorization.

26478489680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195852 (or 195846 counting only the distinct ones).

The product of its (nonzero) digits is 37158912, while the sum is 62.

The spelling of 26478489680 in words is "twenty-six billion, four hundred seventy-eight million, four hundred eighty-nine thousand, six hundred eighty".