3215949867840 has 448 divisors, whose sum is σ = 10890540576000. Its totient is φ = 801751302144.

The previous prime is 3215949867817. The next prime is 3215949867887. The reversal of 3215949867840 is 487689495123.

It is a happy number.

It is a super-2 number, since 2×3215949867840² (a number of 26 digits) contains 22 as substring.

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 63 ways as a sum of consecutive naturals, for example, 426684552 + ... + 426692088.

It is a 1-persistent number, because it is pandigital, but 2⋅3215949867840 = 6431899735680 is not.

Almost surely, 2^{3215949867840} is an apocalyptic number.

3215949867840 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3215949867840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5445270288000).

3215949867840 is an abundant number, since it is smaller than the sum of its proper divisors (7674590708160).

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

3215949867840 is a wasteful number, since it uses less digits than its factorization.

3215949867840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7882 (or 7872 counting only the distinct ones).

The product of its (nonzero) digits is 104509440, while the sum is 66.

The spelling of 3215949867840 in words is "three trillion, two hundred fifteen billion, nine hundred forty-nine million, eight hundred sixty-seven thousand, eight hundred forty".