684849550 has 48 divisors (see below), whose sum is σ = 1588148352. Its totient is φ = 213458400.

The previous prime is 684849533. The next prime is 684849559. The reversal of 684849550 is 55948486.

It is a super-2 number, since 2×684849550² = 938037812270405000, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 684849494 and 684849503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684849559) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 85092 + ... + 92791.

It is an arithmetic number, because the mean of its divisors is an integer number (33086424).

Almost surely, 2^684849550 is an apocalyptic number.

684849550 is an abundant number, since it is smaller than the sum of its proper divisors (903298802).

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

684849550 is a wasteful number, since it uses less digits than its factorization.

684849550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177913 (or 177908 counting only the distinct ones).

The product of its (nonzero) digits is 1382400, while the sum is 49.

The square root of 684849550 is about 26169.6302992610. The cubic root of 684849550 is about 881.4514399589.

The spelling of 684849550 in words is "six hundred eighty-four million, eight hundred forty-nine thousand, five hundred fifty".