26505624780 has 144 divisors (see below), whose sum is σ = 81877635840. Its totient is φ = 6939022464.

The previous prime is 26505624767. The next prime is 26505624793. The reversal of 26505624780 is 8742650562.

26505624780 is a `hidden beast` number, since 2 + 6 + 5 + 0 + 562 + 4 + 7 + 80 = 666.

It is an interprime number because it is at equal distance from previous prime (26505624767) and next prime (26505624793).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3698841 + ... + 3705999.

Almost surely, 2^26505624780 is an apocalyptic number.

26505624780 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 26505624780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40938817920).

26505624780 is an abundant number, since it is smaller than the sum of its proper divisors (55372011060).

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

26505624780 is a wasteful number, since it uses less digits than its factorization.

26505624780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7548 (or 7543 counting only the distinct ones).

The product of its (nonzero) digits is 806400, while the sum is 45.

The spelling of 26505624780 in words is "twenty-six billion, five hundred five million, six hundred twenty-four thousand, seven hundred eighty".