72772277 has 8 divisors (see below), whose sum is σ = 73445400. Its totient is φ = 72102400.

The previous prime is 72772267. The next prime is 72772319. The reversal of 72772277 is 77227727.

It can be written as a sum of positive squares in 4 ways, for example, as 63856081 + 8916196 = 7991^2 + 2986^2 .

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 72772277 - 2¹⁰ = 72771253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72772247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68849 + ... + 69897.

It is an arithmetic number, because the mean of its divisors is an integer number (9180675).

Almost surely, 2^72772277 is an apocalyptic number.

It is an amenable number.

72772277 is a deficient number, since it is larger than the sum of its proper divisors (673123).

72772277 is a wasteful number, since it uses less digits than its factorization.

72772277 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1623.

The product of its digits is 134456, while the sum is 41.

The square root of 72772277 is about 8530.6668555278. Note that the first 3 decimals coincide. The cubic root of 72772277 is about 417.4988862963.

The spelling of 72772277 in words is "seventy-two million, seven hundred seventy-two thousand, two hundred seventy-seven".