75994721 has 4 divisors (see below), whose sum is σ = 82903344. Its totient is φ = 69086100.

The previous prime is 75994687. The next prime is 75994741. The reversal of 75994721 is 12749957.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12749957 = 11 ⋅1159087.

It is a cyclic number.

It is not a de Polignac number, because 75994721 - 2²⁶ = 8885857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (75994741) 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, 3454295 + ... + 3454316.

It is an arithmetic number, because the mean of its divisors is an integer number (20725836).

Almost surely, 2^75994721 is an apocalyptic number.

It is an amenable number.

75994721 is a deficient number, since it is larger than the sum of its proper divisors (6908623).

75994721 is a wasteful number, since it uses less digits than its factorization.

75994721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6908622.

The product of its digits is 158760, while the sum is 44.

The square root of 75994721 is about 8717.4951104087. The cubic root of 75994721 is about 423.5725507806.

The spelling of 75994721 in words is "seventy-five million, nine hundred ninety-four thousand, seven hundred twenty-one".