75063721 has 4 divisors (see below), whose sum is σ = 79479252. Its totient is φ = 70648192.

The previous prime is 75063673. The next prime is 75063739. The reversal of 75063721 is 12736057.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12736057 = 349 ⋅36493.

It can be written as a sum of positive squares in 2 ways, for example, as 60279696 + 14784025 = 7764^2 + 3845^2 .

It is not a de Polignac number, because 75063721 - 2¹⁵ = 75030953 is a prime.

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 a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (75063221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2207740 + ... + 2207773.

It is an arithmetic number, because the mean of its divisors is an integer number (19869813).

Almost surely, 2^75063721 is an apocalyptic number.

It is an amenable number.

75063721 is a deficient number, since it is larger than the sum of its proper divisors (4415531).

75063721 is a wasteful number, since it uses less digits than its factorization.

75063721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4415530.

The product of its (nonzero) digits is 8820, while the sum is 31.

The square root of 75063721 is about 8663.9321904087. The cubic root of 75063721 is about 421.8357307829.

Adding to 75063721 its reverse (12736057), we get a palindrome (87799778).

The spelling of 75063721 in words is "seventy-five million, sixty-three thousand, seven hundred twenty-one".