1687349722 has 8 divisors (see below), whose sum is σ = 2679908436. Its totient is φ = 794046912.

The previous prime is 1687349707. The next prime is 1687349771. The reversal of 1687349722 is 2279437861.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1679278441 + 8071281 = 40979^2 + 2841^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24813933 + ... + 24814000.

Almost surely, 2^1687349722 is an apocalyptic number.

1687349722 is a deficient number, since it is larger than the sum of its proper divisors (992558714).

1687349722 is a wasteful number, since it uses less digits than its factorization.

1687349722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49627952.

The product of its digits is 1016064, while the sum is 49.

The square root of 1687349722 is about 41077.3626465965. The cubic root of 1687349722 is about 1190.5154469707.

The spelling of 1687349722 in words is "one billion, six hundred eighty-seven million, three hundred forty-nine thousand, seven hundred twenty-two".