75498721 has 3 divisors (see below), whose sum is σ = 75507411. Its totient is φ = 75490032.

The previous prime is 75498707. The next prime is 75498727. The reversal of 75498721 is 12789457.

The square root of 75498721 is 8689.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 67881121 + 7617600 = 8239^2 + 2760^2 .

It is not a de Polignac number, because 75498721 - 2⁷ = 75498593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (75498727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 4345 + ... + 13033.

It is an arithmetic number, because the mean of its divisors is an integer number (25169137).

Almost surely, 2^75498721 is an apocalyptic number.

75498721 is the 8689-th square number.

75498721 is the 4345-th centered octagonal number.

It is an amenable number.

75498721 is a deficient number, since it is larger than the sum of its proper divisors (8690).

75498721 is an frugal number, since it uses more digits than its factorization.

75498721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17378 (or 8689 counting only the distinct ones).

The product of its digits is 141120, while the sum is 43.

The cubic root of 75498721 is about 422.6490185449.

The spelling of 75498721 in words is "seventy-five million, four hundred ninety-eight thousand, seven hundred twenty-one".