68138930 has 32 divisors (see below), whose sum is σ = 128383488. Its totient is φ = 26006400.

The previous prime is 68138927. The next prime is 68138963. The reversal of 68138930 is 3983186.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21125 + ... + 24135.

It is an arithmetic number, because the mean of its divisors is an integer number (4011984).

Almost surely, 2^68138930 is an apocalyptic number.

68138930 is a deficient number, since it is larger than the sum of its proper divisors (60244558).

68138930 is a wasteful number, since it uses less digits than its factorization.

68138930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3122.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 68138930 is about 8254.6308215450. The cubic root of 68138930 is about 408.4432938160.

The spelling of 68138930 in words is "sixty-eight million, one hundred thirty-eight thousand, nine hundred thirty".