75552421 has 4 divisors (see below), whose sum is σ = 86345632. Its totient is φ = 64759212.

The previous prime is 75552413. The next prime is 75552431. The reversal of 75552421 is 12425557.

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 not a de Polignac number, because 75552421 - 2³ = 75552413 is a prime.

It is a super-2 number, since 2×75552421² = 11416336637922482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75552431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5396595 + ... + 5396608.

It is an arithmetic number, because the mean of its divisors is an integer number (21586408).

Almost surely, 2^75552421 is an apocalyptic number.

It is an amenable number.

75552421 is a deficient number, since it is larger than the sum of its proper divisors (10793211).

75552421 is a wasteful number, since it uses less digits than its factorization.

75552421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10793210.

The product of its digits is 14000, while the sum is 31.

The square root of 75552421 is about 8692.0895646559. The cubic root of 75552421 is about 422.7492006984.

Adding to 75552421 its reverse (12425557), we get a palindrome (87977978).

The spelling of 75552421 in words is "seventy-five million, five hundred fifty-two thousand, four hundred twenty-one".