75168081 has 10 divisors (see below), whose sum is σ = 112288242. Its totient is φ = 50112000.

The previous prime is 75168077. The next prime is 75168097. The reversal of 75168081 is 18086157.

It can be written as a sum of positive squares in only one way, i.e., 60606225 + 14561856 = 7785^2 + 3816^2 .

It is not a de Polignac number, because 75168081 - 2² = 75168077 is a prime.

It is a super-2 number, since 2×75168081² = 11300480802445122, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (75168001) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 463920 + ... + 464081.

Almost surely, 2^75168081 is an apocalyptic number.

It is an amenable number.

75168081 is a deficient number, since it is larger than the sum of its proper divisors (37120161).

75168081 is an equidigital number, since it uses as much as digits as its factorization.

75168081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 928013 (or 928004 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 36.

The square root of 75168081 is about 8669.9527680374. The cubic root of 75168081 is about 422.0311309514.

The spelling of 75168081 in words is "seventy-five million, one hundred sixty-eight thousand, eighty-one".