72808555 has 4 divisors (see below), whose sum is σ = 87370272. Its totient is φ = 58246840.

The previous prime is 72808543. The next prime is 72808573. The reversal of 72808555 is 55580827.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55580827 = 2693 ⋅20639.

It is not a de Polignac number, because 72808555 - 2⁵ = 72808523 is a prime.

It is a Duffinian number.

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, 7280851 + ... + 7280860.

It is an arithmetic number, because the mean of its divisors is an integer number (21842568).

Almost surely, 2^72808555 is an apocalyptic number.

72808555 is a deficient number, since it is larger than the sum of its proper divisors (14561717).

72808555 is a wasteful number, since it uses less digits than its factorization.

72808555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14561716.

The product of its (nonzero) digits is 112000, while the sum is 40.

The square root of 72808555 is about 8532.7929190858. The cubic root of 72808555 is about 417.5682511198.

The spelling of 72808555 in words is "seventy-two million, eight hundred eight thousand, five hundred fifty-five".