684787634 has 4 divisors (see below), whose sum is σ = 1027181454. Its totient is φ = 342393816.

The previous prime is 684787633. The next prime is 684787667. The reversal of 684787634 is 436787486.

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., 499746025 + 185041609 = 22355^2 + 13603^2 .

It is not an unprimeable number, because it can be changed into a prime (684787633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171196907 + ... + 171196910.

Almost surely, 2^684787634 is an apocalyptic number.

684787634 is a deficient number, since it is larger than the sum of its proper divisors (342393820).

684787634 is a wasteful number, since it uses less digits than its factorization.

684787634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342393819.

The product of its digits is 5419008, while the sum is 53.

The square root of 684787634 is about 26168.4472982254. The cubic root of 684787634 is about 881.4248756854.

The spelling of 684787634 in words is "six hundred eighty-four million, seven hundred eighty-seven thousand, six hundred thirty-four".