68433890 has 24 divisors (see below), whose sum is σ = 143293212. Its totient is φ = 23462880.

The previous prime is 68433811. The next prime is 68433913. The reversal of 68433890 is 9833486.

It can be written as a sum of positive squares in 2 ways, for example, as 68343289 + 90601 = 8267^2 + 301^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 69341 + ... + 70320.

Almost surely, 2^68433890 is an apocalyptic number.

68433890 is an abundant number, since it is smaller than the sum of its proper divisors (74859322).

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

68433890 is a wasteful number, since it uses less digits than its factorization.

68433890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139682 (or 139675 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 41.

The square root of 68433890 is about 8272.4778633732. The cubic root of 68433890 is about 409.0318022947.

The spelling of 68433890 in words is "sixty-eight million, four hundred thirty-three thousand, eight hundred ninety".