1646444472 has 32 divisors (see below), whose sum is σ = 4248890880. Its totient is φ = 531110880.

The previous prime is 1646444461. The next prime is 1646444479. The reversal of 1646444472 is 2744446461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1646444479) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1105738 + ... + 1107225.

It is an arithmetic number, because the mean of its divisors is an integer number (132777840).

Almost surely, 2^1646444472 is an apocalyptic number.

1646444472 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1646444472 is an abundant number, since it is smaller than the sum of its proper divisors (2602446408).

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

1646444472 is a wasteful number, since it uses less digits than its factorization.

1646444472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2213003 (or 2212999 counting only the distinct ones).

The product of its digits is 516096, while the sum is 42.

The square root of 1646444472 is about 40576.4028962647. The cubic root of 1646444472 is about 1180.8163631684.

The spelling of 1646444472 in words is "one billion, six hundred forty-six million, four hundred forty-four thousand, four hundred seventy-two".