1630720664 has 16 divisors (see below), whose sum is σ = 3061498200. Its totient is φ = 814321152.

The previous prime is 1630720643. The next prime is 1630720673. The reversal of 1630720664 is 4660270361.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 123209 + ... + 135800.

Almost surely, 2^1630720664 is an apocalyptic number.

It is an amenable number.

1630720664 is a deficient number, since it is larger than the sum of its proper divisors (1430777536).

1630720664 is a wasteful number, since it uses less digits than its factorization.

1630720664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259802 (or 259798 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 35.

The square root of 1630720664 is about 40382.1825066452. The cubic root of 1630720664 is about 1177.0453379045.

The spelling of 1630720664 in words is "one billion, six hundred thirty million, seven hundred twenty thousand, six hundred sixty-four".