75621145 has 4 divisors (see below), whose sum is σ = 90745380. Its totient is φ = 60496912.

The previous prime is 75621127. The next prime is 75621149. The reversal of 75621145 is 54112657.

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 26998416 + 48622729 = 5196^2 + 6973^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-75621145 is a prime.

It is a super-2 number, since 2×75621145² = 11437115142222050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (75621149) 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, 7562110 + ... + 7562119.

It is an arithmetic number, because the mean of its divisors is an integer number (22686345).

Almost surely, 2^75621145 is an apocalyptic number.

It is an amenable number.

75621145 is a deficient number, since it is larger than the sum of its proper divisors (15124235).

75621145 is a wasteful number, since it uses less digits than its factorization.

75621145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15124234.

The product of its digits is 8400, while the sum is 31.

The square root of 75621145 is about 8696.0419157223. The cubic root of 75621145 is about 422.8773422416.

The spelling of 75621145 in words is "seventy-five million, six hundred twenty-one thousand, one hundred forty-five".