74528140649 has 4 divisors (see below), whose sum is σ = 75934332036. Its totient is φ = 73121949264.

The previous prime is 74528140637. The next prime is 74528140657. The reversal of 74528140649 is 94604182547.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 67343883049 + 7184257600 = 259507^2 + 84760^2 .

It is a cyclic number.

It is not a de Polignac number, because 74528140649 - 2¹⁶ = 74528075113 is a prime.

It is a super-2 number, since 2×74528140649² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 74528140597 and 74528140606.

It is not an unprimeable number, because it can be changed into a prime (74528140679) 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, 703095614 + ... + 703095719.

It is an arithmetic number, because the mean of its divisors is an integer number (18983583009).

Almost surely, 2^74528140649 is an apocalyptic number.

It is an amenable number.

74528140649 is a deficient number, since it is larger than the sum of its proper divisors (1406191387).

74528140649 is a wasteful number, since it uses less digits than its factorization.

74528140649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1406191386.

The product of its (nonzero) digits is 1935360, while the sum is 50.

The spelling of 74528140649 in words is "seventy-four billion, five hundred twenty-eight million, one hundred forty thousand, six hundred forty-nine".