1669631730 has 32 divisors (see below), whose sum is σ = 4315356864. Its totient is φ = 410986176.

The previous prime is 1669631701. The next prime is 1669631731. The reversal of 1669631730 is 371369661.

It is a super-2 number, since 2×1669631730² = 5575340227645585800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1669631731) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2140164 + ... + 2140943.

It is an arithmetic number, because the mean of its divisors is an integer number (134854902).

Almost surely, 2^1669631730 is an apocalyptic number.

1669631730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1669631730 is an abundant number, since it is smaller than the sum of its proper divisors (2645725134).

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

1669631730 is a wasteful number, since it uses less digits than its factorization.

1669631730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4281130.

The product of its (nonzero) digits is 122472, while the sum is 42.

The square root of 1669631730 is about 40861.1273706441. The cubic root of 1669631730 is about 1186.3337792257. Note that the first 3 decimals are identical.

The spelling of 1669631730 in words is "one billion, six hundred sixty-nine million, six hundred thirty-one thousand, seven hundred thirty".