1688716836 has 63 divisors (see below), whose sum is σ = 4436684833. Its totient is φ = 562165920.

The previous prime is 1688716823. The next prime is 1688716849. The reversal of 1688716836 is 6386178861.

The square root of 1688716836 is 41094.

It is a perfect power (a square), and thus also a powerful number.

It is an interprime number because it is at equal distance from previous prime (1688716823) and next prime (1688716849).

It can be written as a sum of positive squares in only one way, i.e., 4435236 + 1684281600 = 2106^2 + 41040^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 20 ways as a sum of consecutive naturals, for example, 2218696 + ... + 2219456.

Almost surely, 2^1688716836 is an apocalyptic number.

1688716836 is the 41094-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1688716836

1688716836 is an abundant number, since it is smaller than the sum of its proper divisors (2747967997).

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

1688716836 is an frugal number, since it uses more digits than its factorization.

1688716836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1544 (or 766 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 54.

The cubic root of 1688716836 is about 1190.8368841830.

The spelling of 1688716836 in words is "one billion, six hundred eighty-eight million, seven hundred sixteen thousand, eight hundred thirty-six".