72775222 has 16 divisors (see below), whose sum is σ = 118423872. Its totient is φ = 33341760.

The previous prime is 72775217. The next prime is 72775231. The reversal of 72775222 is 22257727.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6654 + ... + 13777.

It is an arithmetic number, because the mean of its divisors is an integer number (7401492).

Almost surely, 2^72775222 is an apocalyptic number.

72775222 is a deficient number, since it is larger than the sum of its proper divisors (45648650).

72775222 is a wasteful number, since it uses less digits than its factorization.

72775222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20583.

The product of its digits is 27440, while the sum is 34.

The square root of 72775222 is about 8530.8394663128. The cubic root of 72775222 is about 417.5045181004.

The spelling of 72775222 in words is "seventy-two million, seven hundred seventy-five thousand, two hundred twenty-two".