75005681 has 4 divisors (see below), whose sum is σ = 75955200. Its totient is φ = 74056164.

The previous prime is 75005677. The next prime is 75005701. The reversal of 75005681 is 18650057.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 75005681 - 2² = 75005677 is a prime.

It is a super-2 number, since 2×75005681² = 11251704364547522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (75005881) 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, 474641 + ... + 474798.

It is an arithmetic number, because the mean of its divisors is an integer number (18988800).

Almost surely, 2^75005681 is an apocalyptic number.

It is an amenable number.

75005681 is a deficient number, since it is larger than the sum of its proper divisors (949519).

75005681 is an equidigital number, since it uses as much as digits as its factorization.

75005681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 949518.

The product of its (nonzero) digits is 8400, while the sum is 32.

The square root of 75005681 is about 8660.5820243215. The cubic root of 75005681 is about 421.7269802509.

The spelling of 75005681 in words is "seventy-five million, five thousand, six hundred eighty-one".