1687676399236 has 81 divisors (see below), whose sum is σ = 3312848270277. Its totient is φ = 752026481280.

The previous prime is 1687676399203. The next prime is 1687676399327. The reversal of 1687676399236 is 6329936767861.

The square root of 1687676399236 is 1299106.

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

It can be written as a sum of positive squares in only one way, i.e., 1313934912900 + 373741486336 = 1146270^2 + 611344^2 .

It is a super-2 number, since 2×1687676399236² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 839221471 + ... + 839223481.

Almost surely, 2^{1687676399236} is an apocalyptic number.

1687676399236 is the 1299106-th square number.

It is an amenable number.

1687676399236 is a deficient number, since it is larger than the sum of its proper divisors (1625171871041).

1687676399236 is an equidigital number, since it uses as much as digits as its factorization.

1687676399236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4098 (or 2049 counting only the distinct ones).

The product of its digits is 740710656, while the sum is 73.

The spelling of 1687676399236 in words is "one trillion, six hundred eighty-seven billion, six hundred seventy-six million, three hundred ninety-nine thousand, two hundred thirty-six".