326440136560 has 80 divisors (see below), whose sum is σ = 766808778240. Its totient is φ = 129229107200.

The previous prime is 326440136513. The next prime is 326440136573. The reversal of 326440136560 is 65631044623.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×326440136560² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23255304 + ... + 23269336.

It is an arithmetic number, because the mean of its divisors is an integer number (9585109728).

Almost surely, 2^326440136560 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 326440136560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (383404389120).

326440136560 is an abundant number, since it is smaller than the sum of its proper divisors (440368641680).

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

326440136560 is a wasteful number, since it uses less digits than its factorization.

326440136560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17026 (or 17020 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 40.

The spelling of 326440136560 in words is "three hundred twenty-six billion, four hundred forty million, one hundred thirty-six thousand, five hundred sixty".