72129787 has 2 divisors, whose sum is σ = 72129788. Its totient is φ = 72129786.

The previous prime is 72129781. The next prime is 72129797. The reversal of 72129787 is 78792127.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72129787 is a prime.

It is not a weakly prime, because it can be changed into another prime (72129781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36064893 + 36064894.

It is an arithmetic number, because the mean of its divisors is an integer number (36064894).

Almost surely, 2^72129787 is an apocalyptic number.

72129787 is a deficient number, since it is larger than the sum of its proper divisors (1).

72129787 is an equidigital number, since it uses as much as digits as its factorization.

72129787 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 98784, while the sum is 43.

The square root of 72129787 is about 8492.9257031956. The cubic root of 72129787 is about 416.2665847835.

The spelling of 72129787 in words is "seventy-two million, one hundred twenty-nine thousand, seven hundred eighty-seven".