74264821 has 4 divisors (see below), whose sum is σ = 74441644. Its totient is φ = 74088000.

The previous prime is 74264807. The next prime is 74264833. The reversal of 74264821 is 12846247.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12846247 = 59 ⋅217733.

It can be written as a sum of positive squares in 2 ways, for example, as 39513796 + 34751025 = 6286^2 + 5895^2 .

It is a 3-Lehmer number, since φ(74264821) divides (74264821-1)³.

It is a cyclic number.

It is not a de Polignac number, because 74264821 - 2²⁵ = 40710389 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 (74264851) by changing a digit.

It is a nontrivial repunit in base 420.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87780 + ... + 88621.

It is an arithmetic number, because the mean of its divisors is an integer number (18610411).

Almost surely, 2^74264821 is an apocalyptic number.

It is an amenable number.

74264821 is a deficient number, since it is larger than the sum of its proper divisors (176823).

74264821 is a wasteful number, since it uses less digits than its factorization.

74264821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176822.

The product of its digits is 21504, while the sum is 34.

The square root of 74264821 is about 8617.7039285415. The cubic root of 74264821 is about 420.3338634111. Note that the first 3 decimals are identical.

The spelling of 74264821 in words is "seventy-four million, two hundred sixty-four thousand, eight hundred twenty-one".