684699740 has 12 divisors (see below), whose sum is σ = 1437869496. Its totient is φ = 273879888.

The previous prime is 684699721. The next prime is 684699761. The reversal of 684699740 is 47996486.

It is a happy number.

684699740 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent 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, 17117474 + ... + 17117513.

It is an arithmetic number, because the mean of its divisors is an integer number (119822458).

Almost surely, 2^684699740 is an apocalyptic number.

It is an amenable number.

684699740 is an abundant number, since it is smaller than the sum of its proper divisors (753169756).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

684699740 is a wasteful number, since it uses less digits than its factorization.

684699740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34234996 (or 34234994 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 53.

The square root of 684699740 is about 26166.7678554307. The cubic root of 684699740 is about 881.3871631310.

The spelling of 684699740 in words is "six hundred eighty-four million, six hundred ninety-nine thousand, seven hundred forty".