75542721 has 8 divisors (see below), whose sum is σ = 100847040. Its totient is φ = 50300112.

The previous prime is 75542707. The next prime is 75542737. The reversal of 75542721 is 12724557.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 75542721 - 2⁶ = 75542657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (75342721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12490 + ... + 17523.

It is an arithmetic number, because the mean of its divisors is an integer number (12605880).

Almost surely, 2^75542721 is an apocalyptic number.

It is an amenable number.

75542721 is a deficient number, since it is larger than the sum of its proper divisors (25304319).

75542721 is a wasteful number, since it uses less digits than its factorization.

75542721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30855.

The product of its digits is 19600, while the sum is 33.

The square root of 75542721 is about 8691.5315681415. The cubic root of 75542721 is about 422.7311079945.

The spelling of 75542721 in words is "seventy-five million, five hundred forty-two thousand, seven hundred twenty-one".