3991220492670 has 112 divisors (see below), whose sum is σ = 10827766271232. Its totient is φ = 1058752710720.

The previous prime is 3991220492659. The next prime is 3991220492671. The reversal of 3991220492670 is 762940221993.

3991220492670 is a `hidden beast` number, since 3 + 9 + 91 + 2 + 2 + 0 + 492 + 67 + 0 = 666.

It is a super-2 number, since 2×3991220492670² (a number of 26 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3991220492671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 40837 + ... + 2825616.

Almost surely, 2^{3991220492670} is an apocalyptic number.

3991220492670 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 3991220492670, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5413883135616).

3991220492670 is an abundant number, since it is smaller than the sum of its proper divisors (6836545778562).

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

3991220492670 is a wasteful number, since it uses less digits than its factorization.

3991220492670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2866669 (or 2866654 counting only the distinct ones).

The product of its (nonzero) digits is 2939328, while the sum is 54.

The spelling of 3991220492670 in words is "three trillion, nine hundred ninety-one billion, two hundred twenty million, four hundred ninety-two thousand, six hundred seventy".