68638830 has 128 divisors (see below), whose sum is σ = 191116800. Its totient is φ = 15634944.

The previous prime is 68638813. The next prime is 68638841. The reversal of 68638830 is 3883686.

It is a super-2 number, since 2×68638830² = 9422577967537800, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 437112 + ... + 437268.

It is an arithmetic number, because the mean of its divisors is an integer number (1493100).

Almost surely, 2^68638830 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68638830, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95558400).

68638830 is an abundant number, since it is smaller than the sum of its proper divisors (122477970).

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

68638830 is a wasteful number, since it uses less digits than its factorization.

68638830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258.

The product of its (nonzero) digits is 165888, while the sum is 42.

The square root of 68638830 is about 8284.8554604169. The cubic root of 68638830 is about 409.4397066104.

The spelling of 68638830 in words is "sixty-eight million, six hundred thirty-eight thousand, eight hundred thirty".