72687929 has 2 divisors, whose sum is σ = 72687930. Its totient is φ = 72687928.

The previous prime is 72687917. The next prime is 72687947. The reversal of 72687929 is 92978627.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63170704 + 9517225 = 7948^2 + 3085^2 .

It is a cyclic number.

It is not a de Polignac number, because 72687929 - 2⁴ = 72687913 is a prime.

It is not a weakly prime, because it can be changed into another prime (72687959) 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, 36343964 + 36343965.

It is an arithmetic number, because the mean of its divisors is an integer number (36343965).

Almost surely, 2^72687929 is an apocalyptic number.

It is an amenable number.

72687929 is a deficient number, since it is larger than the sum of its proper divisors (1).

72687929 is an equidigital number, since it uses as much as digits as its factorization.

72687929 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 762048, while the sum is 50.

The square root of 72687929 is about 8525.7216116878. The cubic root of 72687929 is about 417.3375207696.

The spelling of 72687929 in words is "seventy-two million, six hundred eighty-seven thousand, nine hundred twenty-nine".