75743621 has 4 divisors (see below), whose sum is σ = 78355500. Its totient is φ = 73131744.

The previous prime is 75743617. The next prime is 75743677. The reversal of 75743621 is 12634757.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12634757 = 17 ⋅743221.

It can be written as a sum of positive squares in 2 ways, for example, as 34975396 + 40768225 = 5914^2 + 6385^2 .

It is a cyclic number.

It is not a de Polignac number, because 75743621 - 2² = 75743617 is a prime.

It is a super-2 number, since 2×75743621² = 11474192244383282, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75743221) 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, 1305896 + ... + 1305953.

It is an arithmetic number, because the mean of its divisors is an integer number (19588875).

Almost surely, 2^75743621 is an apocalyptic number.

It is an amenable number.

75743621 is a deficient number, since it is larger than the sum of its proper divisors (2611879).

75743621 is a wasteful number, since it uses less digits than its factorization.

75743621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2611878.

The product of its digits is 35280, while the sum is 35.

The square root of 75743621 is about 8703.0811210743. The cubic root of 75743621 is about 423.1055164714.

The spelling of 75743621 in words is "seventy-five million, seven hundred forty-three thousand, six hundred twenty-one".