68387904 has 84 divisors (see below), whose sum is σ = 211123276. Its totient is φ = 21040128.

The previous prime is 68387899. The next prime is 68387909. The reversal of 68387904 is 40978386.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (68387899) and next prime (68387909).

It can be written as a sum of positive squares in 2 ways, for example, as 31809600 + 36578304 = 5640^2 + 6048^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 68387904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68387909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2922 + ... + 12054.

Almost surely, 2^68387904 is an apocalyptic number.

68387904 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68387904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105561638).

68387904 is an abundant number, since it is smaller than the sum of its proper divisors (142735372).

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

68387904 is a wasteful number, since it uses less digits than its factorization.

68387904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9164 (or 9151 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The square root of 68387904 is about 8269.6979388609. The cubic root of 68387904 is about 408.9401617773.

The spelling of 68387904 in words is "sixty-eight million, three hundred eighty-seven thousand, nine hundred four".