684172490 has 32 divisors (see below), whose sum is σ = 1290491136. Its totient is φ = 260663040.

The previous prime is 684172487. The next prime is 684172499. The reversal of 684172490 is 94271486.

It is not an unprimeable number, because it can be changed into a prime (684172499) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49259 + ... + 61601.

It is an arithmetic number, because the mean of its divisors is an integer number (40327848).

Almost surely, 2^684172490 is an apocalyptic number.

684172490 is a deficient number, since it is larger than the sum of its proper divisors (606318646).

684172490 is a wasteful number, since it uses less digits than its factorization.

684172490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12614.

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 684172490 is about 26156.6911133652. The cubic root of 684172490 is about 881.1608689426.

It can be divided in two parts, 68417 and 2490, that added together give a palindrome (70907).

The spelling of 684172490 in words is "six hundred eighty-four million, one hundred seventy-two thousand, four hundred ninety".