75640545 has 12 divisors (see below), whose sum is σ = 131110356. Its totient is φ = 40341600.

The previous prime is 75640529. The next prime is 75640553. The reversal of 75640545 is 54504657.

It is a happy number.

75640545 is a `hidden beast` number, since 7 + 5 + 640 + 5 + 4 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 30603024 + 45037521 = 5532^2 + 6711^2 .

It is not a de Polignac number, because 75640545 - 2⁴ = 75640529 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 840406 + ... + 840495.

It is an arithmetic number, because the mean of its divisors is an integer number (10925863).

Almost surely, 2^75640545 is an apocalyptic number.

It is an amenable number.

75640545 is a deficient number, since it is larger than the sum of its proper divisors (55469811).

75640545 is a wasteful number, since it uses less digits than its factorization.

75640545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1680912 (or 1680909 counting only the distinct ones).

The product of its (nonzero) digits is 84000, while the sum is 36.

The square root of 75640545 is about 8697.1572941968. The cubic root of 75640545 is about 422.9135010831.

The spelling of 75640545 in words is "seventy-five million, six hundred forty thousand, five hundred forty-five".