75734821 has 4 divisors (see below), whose sum is σ = 75754444. Its totient is φ = 75715200.

The previous prime is 75734809. The next prime is 75734849. The reversal of 75734821 is 12843757.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12843757 = 1361 ⋅9437.

It can be written as a sum of positive squares in 2 ways, for example, as 4669921 + 71064900 = 2161^2 + 8430^2 .

It is a cyclic number.

It is not a de Polignac number, because 75734821 - 2²⁵ = 42180389 is a prime.

It is a super-2 number, since 2×75734821² = 11471526223804082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75734861) 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 3 ways as a sum of consecutive naturals, for example, 1890 + ... + 12451.

It is an arithmetic number, because the mean of its divisors is an integer number (18938611).

Almost surely, 2^75734821 is an apocalyptic number.

It is an amenable number.

75734821 is a deficient number, since it is larger than the sum of its proper divisors (19623).

75734821 is a wasteful number, since it uses less digits than its factorization.

75734821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19622.

The product of its digits is 47040, while the sum is 37.

The square root of 75734821 is about 8702.5755383105. The cubic root of 75734821 is about 423.0891301729.

The spelling of 75734821 in words is "seventy-five million, seven hundred thirty-four thousand, eight hundred twenty-one".