75072817 has 4 divisors (see below), whose sum is σ = 75344116. Its totient is φ = 74801520.

The previous prime is 75072757. The next prime is 75072853. The reversal of 75072817 is 71827057.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71827057 = 17 ⋅4225121.

It can be written as a sum of positive squares in 2 ways, for example, as 12362256 + 62710561 = 3516^2 + 7919^2 .

It is a cyclic number.

It is not a de Polignac number, because 75072817 - 2¹¹ = 75070769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (75072317) 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, 135234 + ... + 135787.

It is an arithmetic number, because the mean of its divisors is an integer number (18836029).

Almost surely, 2^75072817 is an apocalyptic number.

It is an amenable number.

75072817 is a deficient number, since it is larger than the sum of its proper divisors (271299).

75072817 is a wasteful number, since it uses less digits than its factorization.

75072817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271298.

The product of its (nonzero) digits is 27440, while the sum is 37.

The square root of 75072817 is about 8664.4571093635. The cubic root of 75072817 is about 421.8527690306.

The spelling of 75072817 in words is "seventy-five million, seventy-two thousand, eight hundred seventeen".