687422066 has 4 divisors (see below), whose sum is σ = 1031133102. Its totient is φ = 343711032.

The previous prime is 687422051. The next prime is 687422083. The reversal of 687422066 is 660224786.

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., 377486041 + 309936025 = 19429^2 + 17605^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171855515 + ... + 171855518.

Almost surely, 2^687422066 is an apocalyptic number.

687422066 is a deficient number, since it is larger than the sum of its proper divisors (343711036).

687422066 is a wasteful number, since it uses less digits than its factorization.

687422066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343711035.

The product of its (nonzero) digits is 193536, while the sum is 41.

The square root of 687422066 is about 26218.7350190660. The cubic root of 687422066 is about 882.5537329753.

The spelling of 687422066 in words is "six hundred eighty-seven million, four hundred twenty-two thousand, sixty-six".