74739509 has 4 divisors (see below), whose sum is σ = 80488716. Its totient is φ = 68990304.

The previous prime is 74739491. The next prime is 74739527. The reversal of 74739509 is 90593747.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90593747 = 1493 ⋅60679.

It is an interprime number because it is at equal distance from previous prime (74739491) and next prime (74739527).

It can be written as a sum of positive squares in 2 ways, for example, as 7006609 + 67732900 = 2647^2 + 8230^2 .

It is a cyclic number.

It is not a de Polignac number, because 74739509 - 2¹² = 74735413 is a prime.

It is a super-2 number, since 2×74739509² = 11171988411122162, which contains 22 as substring.

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 74739509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74735509) 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, 2874584 + ... + 2874609.

It is an arithmetic number, because the mean of its divisors is an integer number (20122179).

Almost surely, 2^74739509 is an apocalyptic number.

It is an amenable number.

74739509 is a deficient number, since it is larger than the sum of its proper divisors (5749207).

74739509 is a wasteful number, since it uses less digits than its factorization.

74739509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5749206.

The product of its (nonzero) digits is 238140, while the sum is 44.

The square root of 74739509 is about 8645.2015014111. The cubic root of 74739509 is about 421.2275293775.

The spelling of 74739509 in words is "seventy-four million, seven hundred thirty-nine thousand, five hundred nine".