684782361 has 6 divisors (see below), whose sum is σ = 989130090. Its totient is φ = 456521568.

The previous prime is 684782359. The next prime is 684782393. The reversal of 684782361 is 163287486.

It can be written as a sum of positive squares in only one way, i.e., 565535961 + 119246400 = 23781^2 + 10920^2 .

It is not a de Polignac number, because 684782361 - 2¹ = 684782359 is a prime.

It is a super-3 number, since 3×684782361³ (a number of 27 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (684789361) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 38043456 + ... + 38043473.

It is an arithmetic number, because the mean of its divisors is an integer number (164855015).

Almost surely, 2^684782361 is an apocalyptic number.

It is an amenable number.

684782361 is a deficient number, since it is larger than the sum of its proper divisors (304347729).

684782361 is a wasteful number, since it uses less digits than its factorization.

684782361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76086935 (or 76086932 counting only the distinct ones).

The product of its digits is 387072, while the sum is 45.

The square root of 684782361 is about 26168.3465469257. The cubic root of 684782361 is about 881.4226132978.

The spelling of 684782361 in words is "six hundred eighty-four million, seven hundred eighty-two thousand, three hundred sixty-one".