684012987 has 24 divisors (see below), whose sum is σ = 1131058656. Its totient is φ = 390208896.

The previous prime is 684012913. The next prime is 684013007. The reversal of 684012987 is 789210486.

It is not a de Polignac number, because 684012987 - 2¹⁰ = 684011963 is a prime.

684012987 is a modest number, since divided by 12987 gives 684 as remainder.

It is not an unprimeable number, because it can be changed into a prime (684012887) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30073 + ... + 47669.

It is an arithmetic number, because the mean of its divisors is an integer number (47127444).

Almost surely, 2^684012987 is an apocalyptic number.

684012987 is a deficient number, since it is larger than the sum of its proper divisors (447045669).

684012987 is a wasteful number, since it uses less digits than its factorization.

684012987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18227 (or 18224 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The square root of 684012987 is about 26153.6419452435. The cubic root of 684012987 is about 881.0923878078.

The spelling of 684012987 in words is "six hundred eighty-four million, twelve thousand, nine hundred eighty-seven".