68640184 has 8 divisors (see below), whose sum is σ = 128700360. Its totient is φ = 34320088.

The previous prime is 68640157. The next prime is 68640193. The reversal of 68640184 is 48104686.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×68640184² = 9422949719107712, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4290004 + ... + 4290019.

It is an arithmetic number, because the mean of its divisors is an integer number (16087545).

Almost surely, 2^68640184 is an apocalyptic number.

It is an amenable number.

68640184 is a deficient number, since it is larger than the sum of its proper divisors (60060176).

68640184 is a wasteful number, since it uses less digits than its factorization.

68640184 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8580029 (or 8580025 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 37.

The square root of 68640184 is about 8284.9371753804. The cubic root of 68640184 is about 409.4423988557.

The spelling of 68640184 in words is "sixty-eight million, six hundred forty thousand, one hundred eighty-four".