26640624020 has 24 divisors (see below), whose sum is σ = 55952064168. Its totient is φ = 10654963200.

The previous prime is 26640624019. The next prime is 26640624053. The reversal of 26640624020 is 2042604662.

It can be written as a sum of positive squares in 4 ways, for example, as 618417424 + 26022206596 = 24868^2 + 161314^2 .

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 99200 + ... + 251240.

It is an arithmetic number, because the mean of its divisors is an integer number (2331336007).

Almost surely, 2^26640624020 is an apocalyptic number.

26640624020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26640624020 is an abundant number, since it is smaller than the sum of its proper divisors (29311440148).

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

26640624020 is a wasteful number, since it uses less digits than its factorization.

26640624020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160811 (or 160809 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 32.

The spelling of 26640624020 in words is "twenty-six billion, six hundred forty million, six hundred twenty-four thousand, twenty".