68207904 has 72 divisors (see below), whose sum is σ = 198132480. Its totient is φ = 22247808.

The previous prime is 68207861. The next prime is 68207917. The reversal of 68207904 is 40970286.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

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, 11017 + ... + 16055.

It is an arithmetic number, because the mean of its divisors is an integer number (2751840).

Almost surely, 2^68207904 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68207904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99066240).

68207904 is an abundant number, since it is smaller than the sum of its proper divisors (129924576).

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

68207904 is a wasteful number, since it uses less digits than its factorization.

68207904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5102 (or 5091 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 68207904 is about 8258.8076621265. The cubic root of 68207904 is about 408.5810636506.

The spelling of 68207904 in words is "sixty-eight million, two hundred seven thousand, nine hundred four".