684998798 has 16 divisors (see below), whose sum is σ = 1123597440. Its totient is φ = 310615800.

The previous prime is 684998779. The next prime is 684998803. The reversal of 684998798 is 897899486.

It is a happy number.

It is a super-2 number, since 2×684998798² = 938446706522889608, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27938 + ... + 46373.

It is an arithmetic number, because the mean of its divisors is an integer number (70224840).

Almost surely, 2^684998798 is an apocalyptic number.

684998798 is a deficient number, since it is larger than the sum of its proper divisors (438598642).

684998798 is a wasteful number, since it uses less digits than its factorization.

684998798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74743.

The product of its digits is 62705664, while the sum is 68.

The square root of 684998798 is about 26172.4816935651. The cubic root of 684998798 is about 881.5154663372.

The spelling of 684998798 in words is "six hundred eighty-four million, nine hundred ninety-eight thousand, seven hundred ninety-eight".