75520809 has 48 divisors (see below), whose sum is σ = 140192640. Its totient is φ = 39826080.

The previous prime is 75520793. The next prime is 75520853. The reversal of 75520809 is 90802557.

It is not a de Polignac number, because 75520809 - 2⁴ = 75520793 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75520009) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15004 + ... + 19394.

It is an arithmetic number, because the mean of its divisors is an integer number (2920680).

Almost surely, 2^75520809 is an apocalyptic number.

It is an amenable number.

75520809 is a deficient number, since it is larger than the sum of its proper divisors (64671831).

75520809 is a wasteful number, since it uses less digits than its factorization.

75520809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4427 (or 4414 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 36.

The square root of 75520809 is about 8690.2709393896. The cubic root of 75520809 is about 422.6902314342.

The spelling of 75520809 in words is "seventy-five million, five hundred twenty thousand, eight hundred nine".