1646662380 has 72 divisors (see below), whose sum is σ = 5067932016. Its totient is φ = 399189120.

The previous prime is 1646662373. The next prime is 1646662403. The reversal of 1646662380 is 832666461.

It is a super-2 number, since 2×1646662380² = 5422993987414528800, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 106147 + ... + 120666.

Almost surely, 2^1646662380 is an apocalyptic number.

1646662380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1646662380 is an abundant number, since it is smaller than the sum of its proper divisors (3421269636).

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

1646662380 is a wasteful number, since it uses less digits than its factorization.

1646662380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226847 (or 226834 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 42.

The square root of 1646662380 is about 40579.0879641226. The cubic root of 1646662380 is about 1180.8684548090.

The spelling of 1646662380 in words is "one billion, six hundred forty-six million, six hundred sixty-two thousand, three hundred eighty".