72017755 has 4 divisors (see below), whose sum is σ = 86421312. Its totient is φ = 57614200.

The previous prime is 72017711. The next prime is 72017773. The reversal of 72017755 is 55771027.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55771027 = 13 ⋅4290079.

It is not a de Polignac number, because 72017755 - 2¹¹ = 72015707 is a prime.

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 72017755.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7201771 + ... + 7201780.

It is an arithmetic number, because the mean of its divisors is an integer number (21605328).

Almost surely, 2^72017755 is an apocalyptic number.

72017755 is a deficient number, since it is larger than the sum of its proper divisors (14403557).

72017755 is a wasteful number, since it uses less digits than its factorization.

72017755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14403556.

The product of its (nonzero) digits is 17150, while the sum is 34.

The square root of 72017755 is about 8486.3275331559. The cubic root of 72017755 is about 416.0509579927.

The spelling of 72017755 in words is "seventy-two million, seventeen thousand, seven hundred fifty-five".