75437993 has 4 divisors (see below), whose sum is σ = 79875540. Its totient is φ = 71000448.

The previous prime is 75437987. The next prime is 75438007. The reversal of 75437993 is 39973457.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 46676224 + 28761769 = 6832^2 + 5363^2 .

It is a cyclic number.

It is not a de Polignac number, because 75437993 - 2⁴ = 75437977 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (75437963) 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, 2218748 + ... + 2218781.

It is an arithmetic number, because the mean of its divisors is an integer number (19968885).

Almost surely, 2^75437993 is an apocalyptic number.

It is an amenable number.

75437993 is a deficient number, since it is larger than the sum of its proper divisors (4437547).

75437993 is a wasteful number, since it uses less digits than its factorization.

75437993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4437546.

The product of its digits is 714420, while the sum is 47.

The square root of 75437993 is about 8685.5047636853. The cubic root of 75437993 is about 422.5356677753.

The spelling of 75437993 in words is "seventy-five million, four hundred thirty-seven thousand, nine hundred ninety-three".