3209491278140 has 96 divisors (see below), whose sum is σ = 7735218301440. Its totient is φ = 1095768112896.

The previous prime is 3209491278121. The next prime is 3209491278143. The reversal of 3209491278140 is 418721949023.

It is a happy number.

3209491278140 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-4 number, since 4×3209491278140⁴ (a number of 51 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3209491278143) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 60314666 + ... + 60367854.

It is an arithmetic number, because the mean of its divisors is an integer number (80575190640).

Almost surely, 2^{3209491278140} 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 3209491278140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3867609150720).

3209491278140 is an abundant number, since it is smaller than the sum of its proper divisors (4525727023300).

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

3209491278140 is a wasteful number, since it uses less digits than its factorization.

3209491278140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55011 (or 55009 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 50.

The spelling of 3209491278140 in words is "three trillion, two hundred nine billion, four hundred ninety-one million, two hundred seventy-eight thousand, one hundred forty".