1690664508 has 144 divisors (see below), whose sum is σ = 4779667200. Its totient is φ = 516559680.

The previous prime is 1690664461. The next prime is 1690664527. The reversal of 1690664508 is 8054660961.

It is a super-2 number, since 2×1690664508² = 5716692957221764128, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3850953 + ... + 3851391.

Almost surely, 2^1690664508 is an apocalyptic number.

1690664508 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1690664508, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2389833600).

1690664508 is an abundant number, since it is smaller than the sum of its proper divisors (3089002692).

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

1690664508 is a wasteful number, since it uses less digits than its factorization.

1690664508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 689 (or 668 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The square root of 1690664508 is about 41117.6909371137. The cubic root of 1690664508 is about 1191.2945232819.

The spelling of 1690664508 in words is "one billion, six hundred ninety million, six hundred sixty-four thousand, five hundred eight".