684066739 has 16 divisors (see below), whose sum is σ = 714597120. Its totient is φ = 654122880.

The previous prime is 684066701. The next prime is 684066743. The reversal of 684066739 is 937660486.

It is a cyclic number.

It is not a de Polignac number, because 684066739 - 2¹³ = 684058547 is a prime.

It is a super-4 number, since 4×684066739⁴ (a number of 36 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 684066692 and 684066701.

It is not an unprimeable number, because it can be changed into a prime (684066769) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1227849 + ... + 1228405.

It is an arithmetic number, because the mean of its divisors is an integer number (44662320).

Almost surely, 2^684066739 is an apocalyptic number.

684066739 is a deficient number, since it is larger than the sum of its proper divisors (30530381).

684066739 is a wasteful number, since it uses less digits than its factorization.

684066739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 990.

The product of its (nonzero) digits is 1306368, while the sum is 49.

The square root of 684066739 is about 26154.6695448442. The cubic root of 684066739 is about 881.1154669200.

The spelling of 684066739 in words is "six hundred eighty-four million, sixty-six thousand, seven hundred thirty-nine".