684099987 has 8 divisors (see below), whose sum is σ = 912408000. Its totient is φ = 455929320.

The previous prime is 684099953. The next prime is 684100003. The reversal of 684099987 is 789990486.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 684099987 - 2⁷ = 684099859 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 684099987.

It is not an unprimeable number, because it can be changed into a prime (684099187) 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 7 ways as a sum of consecutive naturals, for example, 22089 + ... + 43082.

It is an arithmetic number, because the mean of its divisors is an integer number (114051000).

Almost surely, 2^684099987 is an apocalyptic number.

684099987 is a deficient number, since it is larger than the sum of its proper divisors (228308013).

684099987 is a wasteful number, since it uses less digits than its factorization.

684099987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68673.

The product of its (nonzero) digits is 7838208, while the sum is 60.

The square root of 684099987 is about 26155.3051406402. The cubic root of 684099987 is about 881.1297417711.

The spelling of 684099987 in words is "six hundred eighty-four million, ninety-nine thousand, nine hundred eighty-seven".