75408421 has 12 divisors (see below), whose sum is σ = 86002560. Its totient is φ = 65567480.

The previous prime is 75408407. The next prime is 75408449. The reversal of 75408421 is 12480457.

It is not a de Polignac number, because 75408421 - 2⁷ = 75408293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75408121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 661 + ... + 12298.

It is an arithmetic number, because the mean of its divisors is an integer number (7166880).

Almost surely, 2^75408421 is an apocalyptic number.

It is an amenable number.

75408421 is a deficient number, since it is larger than the sum of its proper divisors (10594139).

75408421 is a wasteful number, since it uses less digits than its factorization.

75408421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13016 (or 12993 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 31.

The square root of 75408421 is about 8683.8022202259. The cubic root of 75408421 is about 422.4804486594.

Adding to 75408421 its reverse (12480457), we get a palindrome (87888878).

The spelling of 75408421 in words is "seventy-five million, four hundred eight thousand, four hundred twenty-one".