687142120 has 32 divisors (see below), whose sum is σ = 1766937600. Its totient is φ = 235591488.

The previous prime is 687142103. The next prime is 687142121. The reversal of 687142120 is 21241786.

It is a super-3 number, since 3×687142120³ (a number of 27 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (687142121) 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, 1226760 + ... + 1227319.

It is an arithmetic number, because the mean of its divisors is an integer number (55216800).

Almost surely, 2^687142120 is an apocalyptic number.

It is an amenable number.

687142120 is an abundant number, since it is smaller than the sum of its proper divisors (1079795480).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

687142120 is a wasteful number, since it uses less digits than its factorization.

687142120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2454097 (or 2454093 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 687142120 is about 26213.3958120653. The cubic root of 687142120 is about 882.4339128794.

The spelling of 687142120 in words is "six hundred eighty-seven million, one hundred forty-two thousand, one hundred twenty".