26400971540 has 12 divisors (see below), whose sum is σ = 55442040276. Its totient is φ = 10560388608.

The previous prime is 26400971539. The next prime is 26400971543. The reversal of 26400971540 is 4517900462.

It can be written as a sum of positive squares in 2 ways, for example, as 2941760644 + 23459210896 = 54238^2 + 153164^2 .

It is a super-2 number, since 2×26400971540² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 26400971494 and 26400971503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26400971543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 660024269 + ... + 660024308.

It is an arithmetic number, because the mean of its divisors is an integer number (4620170023).

Almost surely, 2^26400971540 is an apocalyptic number.

26400971540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26400971540 is an abundant number, since it is smaller than the sum of its proper divisors (29041068736).

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

26400971540 is a wasteful number, since it uses less digits than its factorization.

26400971540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1320048586 (or 1320048584 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 38.

The spelling of 26400971540 in words is "twenty-six billion, four hundred million, nine hundred seventy-one thousand, five hundred forty".