72707769 has 12 divisors (see below), whose sum is σ = 105186276. Its totient is φ = 48396192.

The previous prime is 72707753. The next prime is 72707773. The reversal of 72707769 is 96770727.

It can be written as a sum of positive squares in 2 ways, for example, as 68558400 + 4149369 = 8280^2 + 2037^2 .

It is not a de Polignac number, because 72707769 - 2⁴ = 72707753 is a prime.

It is a super-2 number, since 2×72707769² = 10572839345914722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (72707069) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 127 + ... + 12059.

It is an arithmetic number, because the mean of its divisors is an integer number (8765523).

Almost surely, 2^72707769 is an apocalyptic number.

It is an amenable number.

72707769 is a deficient number, since it is larger than the sum of its proper divisors (32478507).

72707769 is a wasteful number, since it uses less digits than its factorization.

72707769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12616 (or 12613 counting only the distinct ones).

The product of its (nonzero) digits is 259308, while the sum is 45.

The square root of 72707769 is about 8526.8850701766. The cubic root of 72707769 is about 417.3754877484.

The spelling of 72707769 in words is "seventy-two million, seven hundred seven thousand, seven hundred sixty-nine".