684696890 has 32 divisors (see below), whose sum is σ = 1290283776. Its totient is φ = 261106560.

The previous prime is 684696889. The next prime is 684696911. The reversal of 684696890 is 98696486.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67235 + ... + 76745.

It is an arithmetic number, because the mean of its divisors is an integer number (40321368).

Almost surely, 2^684696890 is an apocalyptic number.

684696890 is a deficient number, since it is larger than the sum of its proper divisors (605586886).

684696890 is a wasteful number, since it uses less digits than its factorization.

684696890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9854.

The product of its (nonzero) digits is 4478976, while the sum is 56.

The square root of 684696890 is about 26166.7133969859. The cubic root of 684696890 is about 881.3859402315.

It can be divided in two parts, 684696 and 890, that added together give a palindrome (685586).

The spelling of 684696890 in words is "six hundred eighty-four million, six hundred ninety-six thousand, eight hundred ninety".