684507797 has 4 divisors (see below), whose sum is σ = 686232396. Its totient is φ = 682783200.

The previous prime is 684507749. The next prime is 684507809. The reversal of 684507797 is 797705486.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 797705486 = 2 ⋅398852743.

It can be written as a sum of positive squares in 2 ways, for example, as 193043236 + 491464561 = 13894^2 + 22169^2 .

It is a cyclic number.

It is not a de Polignac number, because 684507797 - 2¹⁴ = 684491413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684507727) 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 in 3 ways as a sum of consecutive naturals, for example, 861704 + ... + 862497.

It is an arithmetic number, because the mean of its divisors is an integer number (171558099).

Almost surely, 2^684507797 is an apocalyptic number.

It is an amenable number.

684507797 is a deficient number, since it is larger than the sum of its proper divisors (1724599).

684507797 is a wasteful number, since it uses less digits than its factorization.

684507797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1724598.

The product of its (nonzero) digits is 2963520, while the sum is 53.

The square root of 684507797 is about 26163.0999118988. The cubic root of 684507797 is about 881.3047951979.

The spelling of 684507797 in words is "six hundred eighty-four million, five hundred seven thousand, seven hundred ninety-seven".