75667421 has 4 divisors (see below), whose sum is σ = 75706332. Its totient is φ = 75628512.

The previous prime is 75667381. The next prime is 75667433. The reversal of 75667421 is 12476657.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12476657 = 17 ⋅733921.

It can be written as a sum of positive squares in 2 ways, for example, as 42432196 + 33235225 = 6514^2 + 5765^2 .

It is a cyclic number.

It is not a de Polignac number, because 75667421 - 2¹⁰ = 75666397 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 (75667451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16376 + ... + 20481.

It is an arithmetic number, because the mean of its divisors is an integer number (18926583).

Almost surely, 2^75667421 is an apocalyptic number.

It is an amenable number.

75667421 is a deficient number, since it is larger than the sum of its proper divisors (38911).

75667421 is a wasteful number, since it uses less digits than its factorization.

75667421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38910.

The product of its digits is 70560, while the sum is 38.

The square root of 75667421 is about 8698.7022595327. The cubic root of 75667421 is about 422.9635839117.

The spelling of 75667421 in words is "seventy-five million, six hundred sixty-seven thousand, four hundred twenty-one".