1669639290 has 64 divisors (see below), whose sum is σ = 4376115072. Its totient is φ = 404326400.

The previous prime is 1669639273. The next prime is 1669639339. The reversal of 1669639290 is 929369661.

It is a happy number.

It is a super-3 number, since 3×1669639290³ (a number of 29 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 391570 + ... + 395810.

It is an arithmetic number, because the mean of its divisors is an integer number (68376798).

Almost surely, 2^1669639290 is an apocalyptic number.

1669639290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1669639290 is an abundant number, since it is smaller than the sum of its proper divisors (2706475782).

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

1669639290 is a wasteful number, since it uses less digits than its factorization.

1669639290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5455.

The product of its (nonzero) digits is 944784, while the sum is 51.

The square root of 1669639290 is about 40861.2198790002. The cubic root of 1669639290 is about 1186.3355697742.

The spelling of 1669639290 in words is "one billion, six hundred sixty-nine million, six hundred thirty-nine thousand, two hundred ninety".