74463521 has 6 divisors (see below), whose sum is σ = 81848466. Its totient is φ = 67694000.

The previous prime is 74463517. The next prime is 74463523. The reversal of 74463521 is 12536447.

It can be written as a sum of positive squares in only one way, i.e., 72863296 + 1600225 = 8536^2 + 1265^2 .

It is not a de Polignac number, because 74463521 - 2² = 74463517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (74463523) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 307580 + ... + 307821.

It is an arithmetic number, because the mean of its divisors is an integer number (13641411).

Almost surely, 2^74463521 is an apocalyptic number.

It is an amenable number.

74463521 is a deficient number, since it is larger than the sum of its proper divisors (7384945).

74463521 is a wasteful number, since it uses less digits than its factorization.

74463521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 615423 (or 615412 counting only the distinct ones).

The product of its digits is 20160, while the sum is 32.

The square root of 74463521 is about 8629.2248203416. The cubic root of 74463521 is about 420.7084057591.

Adding to 74463521 its reverse (12536447), we get a palindrome (86999968).

The spelling of 74463521 in words is "seventy-four million, four hundred sixty-three thousand, five hundred twenty-one".