75481821 has 16 divisors (see below), whose sum is σ = 112190400. Its totient is φ = 50156784.

The previous prime is 75481817. The next prime is 75481823. The reversal of 75481821 is 12818457.

It is not a de Polignac number, because 75481821 - 2² = 75481817 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75481823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4150 + ... + 12968.

It is an arithmetic number, because the mean of its divisors is an integer number (7011900).

Almost surely, 2^75481821 is an apocalyptic number.

It is an amenable number.

75481821 is a deficient number, since it is larger than the sum of its proper divisors (36708579).

75481821 is a wasteful number, since it uses less digits than its factorization.

75481821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9145 (or 9139 counting only the distinct ones).

The product of its digits is 17920, while the sum is 36.

The square root of 75481821 is about 8688.0274516141. The cubic root of 75481821 is about 422.6174802560.

The spelling of 75481821 in words is "seventy-five million, four hundred eighty-one thousand, eight hundred twenty-one".