1687047649 has 8 divisors (see below), whose sum is σ = 2041469568. Its totient is φ = 1360979520.

The previous prime is 1687047647. The next prime is 1687047667. The reversal of 1687047649 is 9467407861.

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

It is a cyclic number.

It is not a de Polignac number, because 1687047649 - 2¹ = 1687047647 is a prime.

It is a super-2 number, since 2×1687047649² = 5692259539992854402, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1687047596 and 1687047605.

It is not an unprimeable number, because it can be changed into a prime (1687047647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7088317 + ... + 7088554.

It is an arithmetic number, because the mean of its divisors is an integer number (255183696).

Almost surely, 2^1687047649 is an apocalyptic number.

It is an amenable number.

1687047649 is a deficient number, since it is larger than the sum of its proper divisors (354421919).

1687047649 is a wasteful number, since it uses less digits than its factorization.

1687047649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14176895.

The product of its (nonzero) digits is 2032128, while the sum is 52.

The square root of 1687047649 is about 41073.6856028285. The cubic root of 1687047649 is about 1190.4443998467. Note that the first 3 decimals are identical.

The spelling of 1687047649 in words is "one billion, six hundred eighty-seven million, forty-seven thousand, six hundred forty-nine".