72277121 has 16 divisors (see below), whose sum is σ = 88258560. Its totient is φ = 57808080.

The previous prime is 72277087. The next prime is 72277141. The reversal of 72277121 is 12177227.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72277121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72277141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4856 + ... + 12966.

It is an arithmetic number, because the mean of its divisors is an integer number (5516160).

Almost surely, 2^72277121 is an apocalyptic number.

It is an amenable number.

72277121 is a deficient number, since it is larger than the sum of its proper divisors (15981439).

72277121 is a wasteful number, since it uses less digits than its factorization.

72277121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8204.

The product of its digits is 2744, while the sum is 29.

The square root of 72277121 is about 8501.5952032545. The cubic root of 72277121 is about 416.5498173318.

The spelling of 72277121 in words is "seventy-two million, two hundred seventy-seven thousand, one hundred twenty-one".