75521365 has 8 divisors (see below), whose sum is σ = 93750840. Its totient is φ = 58333632.

The previous prime is 75521297. The next prime is 75521389. The reversal of 75521365 is 56312557.

It can be written as a sum of positive squares in 4 ways, for example, as 161604 + 75359761 = 402^2 + 8681^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 75521365 - 2⁹ = 75520853 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 75521365.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 260274 + ... + 260563.

It is an arithmetic number, because the mean of its divisors is an integer number (11718855).

Almost surely, 2^75521365 is an apocalyptic number.

It is an amenable number.

75521365 is a deficient number, since it is larger than the sum of its proper divisors (18229475).

75521365 is a wasteful number, since it uses less digits than its factorization.

75521365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520871.

The product of its digits is 31500, while the sum is 34.

The square root of 75521365 is about 8690.3029291274. The cubic root of 75521365 is about 422.6912687429.

The spelling of 75521365 in words is "seventy-five million, five hundred twenty-one thousand, three hundred sixty-five".