688962631 has 16 divisors (see below), whose sum is σ = 848130048. Its totient is φ = 546638400.

The previous prime is 688962619. The next prime is 688962653. The reversal of 688962631 is 136269886.

It is a happy number.

It is not a de Polignac number, because 688962631 - 2¹¹ = 688960583 is a prime.

It is a super-2 number, since 2×688962631² = 949339013828884322, 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 (688962611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64030 + ... + 74011.

It is an arithmetic number, because the mean of its divisors is an integer number (53008128).

Almost surely, 2^688962631 is an apocalyptic number.

688962631 is a deficient number, since it is larger than the sum of its proper divisors (159167417).

688962631 is a wasteful number, since it uses less digits than its factorization.

688962631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138102.

The product of its digits is 746496, while the sum is 49.

The square root of 688962631 is about 26248.0976644023. The cubic root of 688962631 is about 883.2125310376.

The spelling of 688962631 in words is "six hundred eighty-eight million, nine hundred sixty-two thousand, six hundred thirty-one".