74821789 has 4 divisors (see below), whose sum is σ = 85510624. Its totient is φ = 64132956.

The previous prime is 74821787. The next prime is 74821819. The reversal of 74821789 is 98712847.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98712847 = 19 ⋅5195413.

It is a cyclic number.

It is not a de Polignac number, because 74821789 - 2¹ = 74821787 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 (74821787) 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, 5344407 + ... + 5344420.

It is an arithmetic number, because the mean of its divisors is an integer number (21377656).

Almost surely, 2^74821789 is an apocalyptic number.

It is an amenable number.

74821789 is a deficient number, since it is larger than the sum of its proper divisors (10688835).

74821789 is a wasteful number, since it uses less digits than its factorization.

74821789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10688834.

The product of its digits is 225792, while the sum is 46.

The square root of 74821789 is about 8649.9589016365. The cubic root of 74821789 is about 421.3820477882.

The spelling of 74821789 in words is "seventy-four million, eight hundred twenty-one thousand, seven hundred eighty-nine".