1688087631 has 8 divisors (see below), whose sum is σ = 2263219504. Its totient is φ = 1119173760.

The previous prime is 1688087591. The next prime is 1688087657. The reversal of 1688087631 is 1367808861.

1688087631 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 1688087631 - 2⁶ = 1688087567 is a prime.

It is a super-2 number, since 2×1688087631² = 5699279699870384322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1688089631) 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, 1553866 + ... + 1554951.

It is an arithmetic number, because the mean of its divisors is an integer number (282902438).

Almost surely, 2^1688087631 is an apocalyptic number.

1688087631 is a deficient number, since it is larger than the sum of its proper divisors (575131873).

1688087631 is a wasteful number, since it uses less digits than its factorization.

1688087631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3109001.

The product of its (nonzero) digits is 387072, while the sum is 48.

The square root of 1688087631 is about 41086.3436070916. The cubic root of 1688087631 is about 1190.6889664299.

The spelling of 1688087631 in words is "one billion, six hundred eighty-eight million, eighty-seven thousand, six hundred thirty-one".