684222440 has 32 divisors (see below), whose sum is σ = 1679456160. Its totient is φ = 248808000.

The previous prime is 684222431. The next prime is 684222449. The reversal of 684222440 is 44222486.

It is an interprime number because it is at equal distance from previous prime (684222431) and next prime (684222449).

It is a junction number, because it is equal to n+sod(n) for n = 684222397 and 684222406.

It is not an unprimeable number, because it can be changed into a prime (684222449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 777086 + ... + 777965.

It is an arithmetic number, because the mean of its divisors is an integer number (52483005).

Almost surely, 2^684222440 is an apocalyptic number.

It is an amenable number.

684222440 is an abundant number, since it is smaller than the sum of its proper divisors (995233720).

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

684222440 is a wasteful number, since it uses less digits than its factorization.

684222440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1555073 (or 1555069 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 32.

The square root of 684222440 is about 26157.6459185455. The cubic root of 684222440 is about 881.1823123237.

The spelling of 684222440 in words is "six hundred eighty-four million, two hundred twenty-two thousand, four hundred forty".