68721544 has 32 divisors (see below), whose sum is σ = 133516800. Its totient is φ = 33125760.

The previous prime is 68721533. The next prime is 68721551. The reversal of 68721544 is 44512786.

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, 120492 + ... + 121060.

It is an arithmetic number, because the mean of its divisors is an integer number (4172400).

Almost surely, 2^68721544 is an apocalyptic number.

It is an amenable number.

68721544 is a deficient number, since it is larger than the sum of its proper divisors (64795256).

68721544 is a wasteful number, since it uses less digits than its factorization.

68721544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1093 (or 1089 counting only the distinct ones).

The product of its digits is 53760, while the sum is 37.

The square root of 68721544 is about 8289.8458369260. The cubic root of 68721544 is about 409.6041072434.

The spelling of 68721544 in words is "sixty-eight million, seven hundred twenty-one thousand, five hundred forty-four".