687622031 has 4 divisors (see below), whose sum is σ = 693930600. Its totient is φ = 681313464.

The previous prime is 687622021. The next prime is 687622051. The reversal of 687622031 is 130226786.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 130226786 = 2 ⋅65113393.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-687622031 is a prime.

It is a super-2 number, since 2×687622031² = 945648115033129922, 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 = 687621982 and 687622000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687622021) 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 3 ways as a sum of consecutive naturals, for example, 3154121 + ... + 3154338.

It is an arithmetic number, because the mean of its divisors is an integer number (173482650).

Almost surely, 2^687622031 is an apocalyptic number.

687622031 is a deficient number, since it is larger than the sum of its proper divisors (6308569).

687622031 is a wasteful number, since it uses less digits than its factorization.

687622031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6308568.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 687622031 is about 26222.5481408653. The cubic root of 687622031 is about 882.6393003710.

The spelling of 687622031 in words is "six hundred eighty-seven million, six hundred twenty-two thousand, thirty-one".