684226890 has 24 divisors (see below), whose sum is σ = 1778990148. Its totient is φ = 182460480.

The previous prime is 684226871. The next prime is 684226919. The reversal of 684226890 is 98622486.

It can be written as a sum of positive squares in 2 ways, for example, as 646735761 + 37491129 = 25431^2 + 6123^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 3801171 + ... + 3801350.

Almost surely, 2^684226890 is an apocalyptic number.

684226890 is an abundant number, since it is smaller than the sum of its proper divisors (1094763258).

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

684226890 is a wasteful number, since it uses less digits than its factorization.

684226890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7602534 (or 7602531 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 45.

The square root of 684226890 is about 26157.7309795785. The cubic root of 684226890 is about 881.1842226444.

The spelling of 684226890 in words is "six hundred eighty-four million, two hundred twenty-six thousand, eight hundred ninety".