687840361 has 8 divisors (see below), whose sum is σ = 741703424. Its totient is φ = 634113360.

The previous prime is 687840359. The next prime is 687840389. The reversal of 687840361 is 163048786.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 687840361 - 2¹ = 687840359 is a prime.

It is a super-2 number, since 2×687840361² = 946248724441220642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (687840301) 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, 23385 + ... + 43846.

It is an arithmetic number, because the mean of its divisors is an integer number (92712928).

Almost surely, 2^687840361 is an apocalyptic number.

It is an amenable number.

687840361 is a deficient number, since it is larger than the sum of its proper divisors (53863063).

687840361 is a wasteful number, since it uses less digits than its factorization.

687840361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68031.

The product of its (nonzero) digits is 193536, while the sum is 43.

The square root of 687840361 is about 26226.7108307542. The cubic root of 687840361 is about 882.7327074258.

The spelling of 687840361 in words is "six hundred eighty-seven million, eight hundred forty thousand, three hundred sixty-one".