68388550 has 48 divisors (see below), whose sum is σ = 131254992. Its totient is φ = 26499200.

The previous prime is 68388473. The next prime is 68388553. The reversal of 68388550 is 5588386.

68388550 = T₂₂₆ + T₂₂₇ + ... + T₇₄₉.

It is a super-2 number, since 2×68388550² = 9353987542205000, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 68388497 and 68388506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68388553) 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 23 ways as a sum of consecutive naturals, for example, 347052 + ... + 347248.

It is an arithmetic number, because the mean of its divisors is an integer number (2734479).

Almost surely, 2^68388550 is an apocalyptic number.

68388550 is a deficient number, since it is larger than the sum of its proper divisors (62866442).

68388550 is a wasteful number, since it uses less digits than its factorization.

68388550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393 (or 388 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 43.

The square root of 68388550 is about 8269.7369970272. The cubic root of 68388550 is about 408.9414494052.

The spelling of 68388550 in words is "sixty-eight million, three hundred eighty-eight thousand, five hundred fifty".