1688746290 has 192 divisors, whose sum is σ = 5180692608. Its totient is φ = 348364800.

The previous prime is 1688746271. The next prime is 1688746291. The reversal of 1688746290 is 926478861.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1688746291) by changing a digit.

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 95 ways as a sum of consecutive naturals, for example, 2926482 + ... + 2927058.

It is an arithmetic number, because the mean of its divisors is an integer number (26982774).

Almost surely, 2^1688746290 is an apocalyptic number.

1688746290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1688746290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2590346304).

1688746290 is an abundant number, since it is smaller than the sum of its proper divisors (3491946318).

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

1688746290 is a wasteful number, since it uses less digits than its factorization.

1688746290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 793 (or 786 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 51.

The square root of 1688746290 is about 41094.3583719225. The cubic root of 1688746290 is about 1190.8438075276.

The spelling of 1688746290 in words is "one billion, six hundred eighty-eight million, seven hundred forty-six thousand, two hundred ninety".