72277669 has 2 divisors, whose sum is σ = 72277670. Its totient is φ = 72277668.

The previous prime is 72277651. The next prime is 72277679. The reversal of 72277669 is 96677227.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36457444 + 35820225 = 6038^2 + 5985^2 .

It is a cyclic number.

It is not a de Polignac number, because 72277669 - 2²³ = 63889061 is a prime.

It is a super-2 number, since 2×72277669² = 10448122872147122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72277609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36138834 + 36138835.

It is an arithmetic number, because the mean of its divisors is an integer number (36138835).

Almost surely, 2^72277669 is an apocalyptic number.

It is an amenable number.

72277669 is a deficient number, since it is larger than the sum of its proper divisors (1).

72277669 is an equidigital number, since it uses as much as digits as its factorization.

72277669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 444528, while the sum is 46.

The square root of 72277669 is about 8501.6274324390. The cubic root of 72277669 is about 416.5508700795.

The spelling of 72277669 in words is "seventy-two million, two hundred seventy-seven thousand, six hundred sixty-nine".