75621013 has 4 divisors (see below), whose sum is σ = 81438028. Its totient is φ = 69804000.

The previous prime is 75620999. The next prime is 75621019. The reversal of 75621013 is 31012657.

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 32285124 + 43335889 = 5682^2 + 6583^2 .

It is a cyclic number.

It is not a de Polignac number, because 75621013 - 2²⁵ = 42066581 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 (75621019) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 2908488 + ... + 2908513.

It is an arithmetic number, because the mean of its divisors is an integer number (20359507).

Almost surely, 2^75621013 is an apocalyptic number.

It is an amenable number.

75621013 is a deficient number, since it is larger than the sum of its proper divisors (5817015).

75621013 is a wasteful number, since it uses less digits than its factorization.

75621013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5817014.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 75621013 is about 8696.0343260592. The cubic root of 75621013 is about 422.8770961912.

The spelling of 75621013 in words is "seventy-five million, six hundred twenty-one thousand, thirteen".