75129649 has 8 divisors (see below), whose sum is σ = 85932288. Its totient is φ = 64344480.

The previous prime is 75129611. The next prime is 75129683. The reversal of 75129649 is 94692157.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 75129649 - 2⁷ = 75129521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (75129049) 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 7 ways as a sum of consecutive naturals, for example, 6744 + ... + 13990.

It is an arithmetic number, because the mean of its divisors is an integer number (10741536).

Almost surely, 2^75129649 is an apocalyptic number.

It is an amenable number.

75129649 is a deficient number, since it is larger than the sum of its proper divisors (10802639).

75129649 is a wasteful number, since it uses less digits than its factorization.

75129649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8735.

The product of its digits is 136080, while the sum is 43.

The square root of 75129649 is about 8667.7360942751. The cubic root of 75129649 is about 421.9591932121.

It can be divided in two parts, 7512 and 9649, that added together give a square (17161 = 131²).

The spelling of 75129649 in words is "seventy-five million, one hundred twenty-nine thousand, six hundred forty-nine".