26720421840 has 480 divisors, whose sum is σ = 109251507456. Its totient is φ = 5713182720.

The previous prime is 26720421839. The next prime is 26720421869. The reversal of 26720421840 is 4812402762.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 26720421795 and 26720421804.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 15507219 + ... + 15508941.

Almost surely, 2^26720421840 is an apocalyptic number.

26720421840 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 26720421840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54625753728).

26720421840 is an abundant number, since it is smaller than the sum of its proper divisors (82531085616).

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

26720421840 is a wasteful number, since it uses less digits than its factorization.

26720421840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1947 (or 1938 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 36.

The spelling of 26720421840 in words is "twenty-six billion, seven hundred twenty million, four hundred twenty-one thousand, eight hundred forty".