75720251 has 8 divisors (see below), whose sum is σ = 77026320. Its totient is φ = 74419488.

The previous prime is 75720223. The next prime is 75720277. The reversal of 75720251 is 15202757.

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 75720251 - 2¹⁰ = 75719227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (75720451) 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, 36305 + ... + 38333.

It is an arithmetic number, because the mean of its divisors is an integer number (9628290).

Almost surely, 2^75720251 is an apocalyptic number.

75720251 is a deficient number, since it is larger than the sum of its proper divisors (1306069).

75720251 is a wasteful number, since it uses less digits than its factorization.

75720251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2653.

The product of its (nonzero) digits is 4900, while the sum is 29.

The square root of 75720251 is about 8701.7383895403. The cubic root of 75720251 is about 423.0619968856.

The spelling of 75720251 in words is "seventy-five million, seven hundred twenty thousand, two hundred fifty-one".