70387729 has 2 divisors, whose sum is σ = 70387730. Its totient is φ = 70387728.

The previous prime is 70387699. The next prime is 70387739. The reversal of 70387729 is 92778307.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49730704 + 20657025 = 7052^2 + 4545^2 .

It is a cyclic number.

It is not a de Polignac number, because 70387729 - 2²⁵ = 36833297 is a prime.

It is not a weakly prime, because it can be changed into another prime (70387739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35193864 + 35193865.

It is an arithmetic number, because the mean of its divisors is an integer number (35193865).

Almost surely, 2^70387729 is an apocalyptic number.

It is an amenable number.

70387729 is a deficient number, since it is larger than the sum of its proper divisors (1).

70387729 is an equidigital number, since it uses as much as digits as its factorization.

70387729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 148176, while the sum is 43.

The square root of 70387729 is about 8389.7395072791. The cubic root of 70387729 is about 412.8880540512. Note that the first 3 decimals are identical.

The spelling of 70387729 in words is "seventy million, three hundred eighty-seven thousand, seven hundred twenty-nine".