688887031 has 16 divisors (see below), whose sum is σ = 813568000. Its totient is φ = 582977304.

The previous prime is 688887029. The next prime is 688887041. The reversal of 688887031 is 130788886.

It is not a de Polignac number, because 688887031 - 2¹ = 688887029 is a prime.

It is a super-2 number, since 2×688887031² = 949130682959989922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688887041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14386 + ... + 39808.

It is an arithmetic number, because the mean of its divisors is an integer number (50848000).

Almost surely, 2^688887031 is an apocalyptic number.

688887031 is a deficient number, since it is larger than the sum of its proper divisors (124680969).

688887031 is an equidigital number, since it uses as much as digits as its factorization.

688887031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25523 (or 25509 counting only the distinct ones).

The product of its (nonzero) digits is 516096, while the sum is 49.

The square root of 688887031 is about 26246.6575205301. The cubic root of 688887031 is about 883.1802248298.

The spelling of 688887031 in words is "six hundred eighty-eight million, eight hundred eighty-seven thousand, thirty-one".