70028729 has 8 divisors (see below), whose sum is σ = 74302920. Its totient is φ = 65771776.

The previous prime is 70028723. The next prime is 70028771. The reversal of 70028729 is 92782007.

It can be written as a sum of positive squares in 4 ways, for example, as 27583504 + 42445225 = 5252^2 + 6515^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 70028729 - 2⁴ = 70028713 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (70028723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4607 + ... + 12699.

It is an arithmetic number, because the mean of its divisors is an integer number (9287865).

Almost surely, 2^70028729 is an apocalyptic number.

It is an amenable number.

70028729 is a deficient number, since it is larger than the sum of its proper divisors (4274191).

70028729 is a wasteful number, since it uses less digits than its factorization.

70028729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8619.

The product of its (nonzero) digits is 14112, while the sum is 35.

The square root of 70028729 is about 8368.3169753541. The cubic root of 70028729 is about 412.1849034148.

The spelling of 70028729 in words is "seventy million, twenty-eight thousand, seven hundred twenty-nine".