26815604440 has 16 divisors (see below), whose sum is σ = 60335110080. Its totient is φ = 10726241760.

The previous prime is 26815604437. The next prime is 26815604447. The reversal of 26815604440 is 4440651862.

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 670390111 = 26815604440 / (2 + 6 + 8 + 1 + 5 + 6 + 0 + 4 + 4 + 4 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 26815604393 and 26815604402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26815604447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 335195016 + ... + 335195095.

It is an arithmetic number, because the mean of its divisors is an integer number (3770944380).

Almost surely, 2^26815604440 is an apocalyptic number.

26815604440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26815604440 is an abundant number, since it is smaller than the sum of its proper divisors (33519505640).

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

26815604440 is a wasteful number, since it uses less digits than its factorization.

26815604440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670390122 (or 670390118 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 40.

The spelling of 26815604440 in words is "twenty-six billion, eight hundred fifteen million, six hundred four thousand, four hundred forty".