74320451 has 4 divisors (see below), whose sum is σ = 75002400. Its totient is φ = 73638504.

The previous prime is 74320409. The next prime is 74320453. The reversal of 74320451 is 15402347.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15402347 = 41 ⋅375667.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74320451 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 74320451.

It is not an unprimeable number, because it can be changed into a prime (74320453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 340811 + ... + 341028.

It is an arithmetic number, because the mean of its divisors is an integer number (18750600).

Almost surely, 2^74320451 is an apocalyptic number.

74320451 is a deficient number, since it is larger than the sum of its proper divisors (681949).

74320451 is a wasteful number, since it uses less digits than its factorization.

74320451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 681948.

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 74320451 is about 8620.9309822084. The cubic root of 74320451 is about 420.4387912282.

Adding to 74320451 its reverse (15402347), we get a palindrome (89722798).

The spelling of 74320451 in words is "seventy-four million, three hundred twenty thousand, four hundred fifty-one".