687422746 has 4 divisors (see below), whose sum is σ = 1031134122. Its totient is φ = 343711372.

The previous prime is 687422719. The next prime is 687422753. The reversal of 687422746 is 647224786.

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., 491730625 + 195692121 = 22175^2 + 13989^2 .

It is a junction number, because it is equal to n+sod(n) for n = 687422696 and 687422705.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171855685 + ... + 171855688.

Almost surely, 2^687422746 is an apocalyptic number.

687422746 is a deficient number, since it is larger than the sum of its proper divisors (343711376).

687422746 is a wasteful number, since it uses less digits than its factorization.

687422746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343711375.

The product of its digits is 903168, while the sum is 46.

The square root of 687422746 is about 26218.7479868891. The cubic root of 687422746 is about 882.5540239834.

The spelling of 687422746 in words is "six hundred eighty-seven million, four hundred twenty-two thousand, seven hundred forty-six".