75520013 has 4 divisors (see below), whose sum is σ = 76758108. Its totient is φ = 74281920.

The previous prime is 75520009. The next prime is 75520021. The reversal of 75520013 is 31002557.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 28761769 + 46758244 = 5363^2 + 6838^2 .

It is a cyclic number.

It is not a de Polignac number, because 75520013 - 2² = 75520009 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75520043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 618956 + ... + 619077.

It is an arithmetic number, because the mean of its divisors is an integer number (19189527).

Almost surely, 2^75520013 is an apocalyptic number.

It is an amenable number.

75520013 is a deficient number, since it is larger than the sum of its proper divisors (1238095).

75520013 is a wasteful number, since it uses less digits than its factorization.

75520013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1238094.

The product of its (nonzero) digits is 1050, while the sum is 23.

The square root of 75520013 is about 8690.2251409270. The cubic root of 75520013 is about 422.6887463573.

The spelling of 75520013 in words is "seventy-five million, five hundred twenty thousand, thirteen".