684776601 has 12 divisors (see below), whose sum is σ = 989350180. Its totient is φ = 456412320.

The previous prime is 684776579. The next prime is 684776633. The reversal of 684776601 is 106677486.

It can be written as a sum of positive squares in 2 ways, for example, as 399200400 + 285576201 = 19980^2 + 16899^2 .

It is not a de Polignac number, because 684776601 - 2⁹ = 684776089 is a prime.

It is a super-2 number, since 2×684776601² = 937837986554226402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (684776671) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 64755 + ... + 74583.

Almost surely, 2^684776601 is an apocalyptic number.

It is an amenable number.

684776601 is a deficient number, since it is larger than the sum of its proper divisors (304573579).

684776601 is a wasteful number, since it uses less digits than its factorization.

684776601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17576 (or 17573 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 45.

The square root of 684776601 is about 26168.2364900656. The cubic root of 684776601 is about 881.4201419488.

It can be divided in two parts, 68477 and 6601, that added together give a triangular number (75078 = T₃₈₇).

The spelling of 684776601 in words is "six hundred eighty-four million, seven hundred seventy-six thousand, six hundred one".