687107942 has 4 divisors (see below), whose sum is σ = 1030661916. Its totient is φ = 343553970.

The previous prime is 687107903. The next prime is 687107977. The reversal of 687107942 is 249701786.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 249701786 = 2 ⋅124850893.

It is a junction number, because it is equal to n+sod(n) for n = 687107893 and 687107902.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 171776984 + ... + 171776987.

It is an arithmetic number, because the mean of its divisors is an integer number (257665479).

Almost surely, 2^687107942 is an apocalyptic number.

687107942 is a deficient number, since it is larger than the sum of its proper divisors (343553974).

687107942 is a wasteful number, since it uses less digits than its factorization.

687107942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343553973.

The product of its (nonzero) digits is 169344, while the sum is 44.

The square root of 687107942 is about 26212.7438853700. The cubic root of 687107942 is about 882.4192820748.

The spelling of 687107942 in words is "six hundred eighty-seven million, one hundred seven thousand, nine hundred forty-two".