1646671632 has 40 divisors (see below), whose sum is σ = 4477793760. Its totient is φ = 520001280.

The previous prime is 1646671589. The next prime is 1646671633. The reversal of 1646671632 is 2361766461.

It is not an unprimeable number, because it can be changed into a prime (1646671633) 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, 901869 + ... + 903692.

It is an arithmetic number, because the mean of its divisors is an integer number (111944844).

Almost surely, 2^1646671632 is an apocalyptic number.

1646671632 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1646671632 is an abundant number, since it is smaller than the sum of its proper divisors (2831122128).

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

1646671632 is a wasteful number, since it uses less digits than its factorization.

1646671632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1805591 (or 1805585 counting only the distinct ones).

The product of its digits is 217728, while the sum is 42.

The square root of 1646671632 is about 40579.2019635675. The cubic root of 1646671632 is about 1180.8706664291.

The spelling of 1646671632 in words is "one billion, six hundred forty-six million, six hundred seventy-one thousand, six hundred thirty-two".