3991456770 has 256 divisors, whose sum is σ = 11817418752. Its totient is φ = 843540480.

The previous prime is 3991456769. The next prime is 3991456793. The reversal of 3991456770 is 776541993.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 17583397 + ... + 17583623.

It is an arithmetic number, because the mean of its divisors is an integer number (46161792).

Almost surely, 2^3991456770 is an apocalyptic number.

3991456770 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 3991456770, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5908709376).

3991456770 is an abundant number, since it is smaller than the sum of its proper divisors (7825961982).

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

3991456770 is a wasteful number, since it uses less digits than its factorization.

3991456770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385.

The product of its (nonzero) digits is 1428840, while the sum is 51.

The square root of 3991456770 is about 63177.9769381705. The cubic root of 3991456770 is about 1586.2701187430.

The spelling of 3991456770 in words is "three billion, nine hundred ninety-one million, four hundred fifty-six thousand, seven hundred seventy".