75239945 has 16 divisors (see below), whose sum is σ = 101675520. Its totient is φ = 52953600.

The previous prime is 75239933. The next prime is 75239953. The reversal of 75239945 is 54993257.

It is not a de Polignac number, because 75239945 - 2⁴ = 75239929 is a prime.

It is a super-2 number, since 2×75239945² = 11322098647206050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 75239896 and 75239905.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20360 + ... + 23769.

It is an arithmetic number, because the mean of its divisors is an integer number (6354720).

Almost surely, 2^75239945 is an apocalyptic number.

It is an amenable number.

75239945 is a deficient number, since it is larger than the sum of its proper divisors (26435575).

75239945 is a wasteful number, since it uses less digits than its factorization.

75239945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44176.

The product of its digits is 340200, while the sum is 44.

The square root of 75239945 is about 8674.0962065220. The cubic root of 75239945 is about 422.1655815705.

The spelling of 75239945 in words is "seventy-five million, two hundred thirty-nine thousand, nine hundred forty-five".