1646044416 has 180 divisors, whose sum is σ = 4948458592. Its totient is φ = 544195584.

The previous prime is 1646044403. The next prime is 1646044453. The reversal of 1646044416 is 6144406461.

1646044416 is a `hidden beast` number, since 1 + 6 + 4 + 604 + 4 + 41 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3379725 + ... + 3380211.

Almost surely, 2^1646044416 is an apocalyptic number.

1646044416 is a gapful number since it is divisible by the number (16) 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 1646044416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2474229296).

1646044416 is an abundant number, since it is smaller than the sum of its proper divisors (3302414176).

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

1646044416 is an equidigital number, since it uses as much as digits as its factorization.

1646044416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 678 (or 655 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 36.

The square root of 1646044416 is about 40571.4729335774. The cubic root of 1646044416 is about 1180.7207164693.

The spelling of 1646044416 in words is "one billion, six hundred forty-six million, forty-four thousand, four hundred sixteen".