68143744 has 16 divisors (see below), whose sum is σ = 135755370. Its totient is φ = 34071808.

The previous prime is 68143723. The next prime is 68143781. The reversal of 68143744 is 44734186.

It can be written as a sum of positive squares in only one way, i.e., 39841344 + 28302400 = 6312^2 + 5320^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 266059 + ... + 266314.

Almost surely, 2^68143744 is an apocalyptic number.

68143744 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

68143744 is a deficient number, since it is larger than the sum of its proper divisors (67611626).

68143744 is an equidigital number, since it uses as much as digits as its factorization.

68143744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 532387 (or 532375 counting only the distinct ones).

The product of its digits is 64512, while the sum is 37.

The square root of 68143744 is about 8254.9224102956. The cubic root of 68143744 is about 408.4529123983.

The spelling of 68143744 in words is "sixty-eight million, one hundred forty-three thousand, seven hundred forty-four".