74863521 has 10 divisors (see below), whose sum is σ = 111833282. Its totient is φ = 49908960.

The previous prime is 74863519. The next prime is 74863541. The reversal of 74863521 is 12536847.

74863521 is a `hidden beast` number, since 74 + 8 + 63 + 521 = 666.

It can be written as a sum of positive squares in only one way, i.e., 68558400 + 6305121 = 8280^2 + 2511^2 .

It is not a de Polignac number, because 74863521 - 2¹ = 74863519 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (74863541) 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 9 ways as a sum of consecutive naturals, for example, 462040 + ... + 462201.

Almost surely, 2^74863521 is an apocalyptic number.

It is an amenable number.

74863521 is a deficient number, since it is larger than the sum of its proper divisors (36969761).

74863521 is an equidigital number, since it uses as much as digits as its factorization.

74863521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 924253 (or 924244 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 74863521 is about 8652.3708311653. The cubic root of 74863521 is about 421.4603754496.

The spelling of 74863521 in words is "seventy-four million, eight hundred sixty-three thousand, five hundred twenty-one".