687140858 has 4 divisors (see below), whose sum is σ = 1030711290. Its totient is φ = 343570428.

The previous prime is 687140777. The next prime is 687140879. The reversal of 687140858 is 858041786.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 613404289 + 73736569 = 24767^2 + 8587^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171785213 + ... + 171785216.

Almost surely, 2^687140858 is an apocalyptic number.

687140858 is a deficient number, since it is larger than the sum of its proper divisors (343570432).

687140858 is a wasteful number, since it uses less digits than its factorization.

687140858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343570431.

The product of its (nonzero) digits is 430080, while the sum is 47.

The square root of 687140858 is about 26213.3717403923. The cubic root of 687140858 is about 882.4333726553.

The spelling of 687140858 in words is "six hundred eighty-seven million, one hundred forty thousand, eight hundred fifty-eight".