68643380 has 24 divisors (see below), whose sum is σ = 155240232. Its totient is φ = 25345152.

The previous prime is 68643353. The next prime is 68643391. The reversal of 68643380 is 8334686.

It can be written as a sum of positive squares in 4 ways, for example, as 2676496 + 65966884 = 1636^2 + 8122^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 131747 + ... + 132266.

It is an arithmetic number, because the mean of its divisors is an integer number (6468343).

Almost surely, 2^68643380 is an apocalyptic number.

It is an amenable number.

68643380 is an abundant number, since it is smaller than the sum of its proper divisors (86596852).

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

68643380 is a wasteful number, since it uses less digits than its factorization.

68643380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264035 (or 264033 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 38.

The square root of 68643380 is about 8285.1300532943. The cubic root of 68643380 is about 409.4487535279.

The spelling of 68643380 in words is "sixty-eight million, six hundred forty-three thousand, three hundred eighty".