684980995 has 4 divisors (see below), whose sum is σ = 821977200. Its totient is φ = 547984792.

The previous prime is 684980987. The next prime is 684981007. The reversal of 684980995 is 599089486.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 684980995 - 2³ = 684980987 is a prime.

It is a super-2 number, since 2×684980995² = 938397927022380050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68498095 + ... + 68498104.

It is an arithmetic number, because the mean of its divisors is an integer number (205494300).

Almost surely, 2^684980995 is an apocalyptic number.

684980995 is a deficient number, since it is larger than the sum of its proper divisors (136996205).

684980995 is a wasteful number, since it uses less digits than its factorization.

684980995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136996204.

The product of its (nonzero) digits is 5598720, while the sum is 58.

The square root of 684980995 is about 26172.1415822244. The cubic root of 684980995 is about 881.5078294597.

The spelling of 684980995 in words is "six hundred eighty-four million, nine hundred eighty thousand, nine hundred ninety-five".