75449421 has 16 divisors (see below), whose sum is σ = 111957120. Its totient is φ = 50218560.

The previous prime is 75449419. The next prime is 75449447. The reversal of 75449421 is 12494457.

It is a happy number.

75449421 is a `hidden beast` number, since 7 + 544 + 94 + 21 = 666.

It is not a de Polignac number, because 75449421 - 2¹ = 75449419 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 (75449411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18181 + ... + 21941.

It is an arithmetic number, because the mean of its divisors is an integer number (6997320).

Almost surely, 2^75449421 is an apocalyptic number.

It is an amenable number.

75449421 is a deficient number, since it is larger than the sum of its proper divisors (36507699).

75449421 is a wasteful number, since it uses less digits than its factorization.

75449421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4513 (or 4507 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 75449421 is about 8686.1626164838. The cubic root of 75449421 is about 422.5570031512.

The spelling of 75449421 in words is "seventy-five million, four hundred forty-nine thousand, four hundred twenty-one".