684238090 has 8 divisors (see below), whose sum is σ = 1231628580. Its totient is φ = 273695232.

The previous prime is 684238081. The next prime is 684238099. The reversal of 684238090 is 90832486.

It is an interprime number because it is at equal distance from previous prime (684238081) and next prime (684238099).

It can be written as a sum of positive squares in 2 ways, for example, as 639735849 + 44502241 = 25293^2 + 6671^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (684238099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34211895 + ... + 34211914.

Almost surely, 2^684238090 is an apocalyptic number.

684238090 is a deficient number, since it is larger than the sum of its proper divisors (547390490).

684238090 is a wasteful number, since it uses less digits than its factorization.

684238090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68423816.

The product of its (nonzero) digits is 82944, while the sum is 40.

The square root of 684238090 is about 26157.9450645497. The cubic root of 684238090 is about 881.1890306058.

The spelling of 684238090 in words is "six hundred eighty-four million, two hundred thirty-eight thousand, ninety".