72778205 has 8 divisors (see below), whose sum is σ = 87544800. Its totient is φ = 58081936.

The previous prime is 72778171. The next prime is 72778213. The reversal of 72778205 is 50287727.

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 72778205 - 2¹⁶ = 72712669 is a prime.

It is a congruent number.

It is an unprimeable number.

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, 15275 + ... + 19464.

It is an arithmetic number, because the mean of its divisors is an integer number (10943100).

Almost surely, 2^72778205 is an apocalyptic number.

It is an amenable number.

72778205 is a deficient number, since it is larger than the sum of its proper divisors (14766595).

72778205 is a wasteful number, since it uses less digits than its factorization.

72778205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35163.

The product of its (nonzero) digits is 54880, while the sum is 38.

The square root of 72778205 is about 8531.0143007734. The cubic root of 72778205 is about 417.5102224181.

The spelling of 72778205 in words is "seventy-two million, seven hundred seventy-eight thousand, two hundred five".