72889669 has 2 divisors, whose sum is σ = 72889670. Its totient is φ = 72889668.

The previous prime is 72889657. The next prime is 72889679. The reversal of 72889669 is 96698827.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47789569 + 25100100 = 6913^2 + 5010^2 .

It is a cyclic number.

It is not a de Polignac number, because 72889669 - 2⁵ = 72889637 is a prime.

It is a super-2 number, since 2×72889669² = 10625807693859122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72889679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36444834 + 36444835.

It is an arithmetic number, because the mean of its divisors is an integer number (36444835).

Almost surely, 2^72889669 is an apocalyptic number.

It is an amenable number.

72889669 is a deficient number, since it is larger than the sum of its proper divisors (1).

72889669 is an equidigital number, since it uses as much as digits as its factorization.

72889669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2612736, while the sum is 55.

The square root of 72889669 is about 8537.5446704541. The cubic root of 72889669 is about 417.7232606549.

The spelling of 72889669 in words is "seventy-two million, eight hundred eighty-nine thousand, six hundred sixty-nine".