74580021 has 10 divisors (see below), whose sum is σ = 111409782. Its totient is φ = 49719960.

The previous prime is 74580001. The next prime is 74580043. The reversal of 74580021 is 12008547.

It can be written as a sum of positive squares in only one way, i.e., 64883025 + 9696996 = 8055^2 + 3114^2 .

It is not a de Polignac number, because 74580021 - 2¹⁴ = 74563637 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74580001) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 460290 + ... + 460451.

Almost surely, 2^74580021 is an apocalyptic number.

It is an amenable number.

74580021 is a deficient number, since it is larger than the sum of its proper divisors (36829761).

74580021 is an equidigital number, since it uses as much as digits as its factorization.

74580021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 920753 (or 920744 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 74580021 is about 8635.9724987983. The cubic root of 74580021 is about 420.9276943019.

Adding to 74580021 its reverse (12008547), we get a palindrome (86588568).

The spelling of 74580021 in words is "seventy-four million, five hundred eighty thousand, twenty-one".