70729217 has 4 divisors (see below), whose sum is σ = 76169940. Its totient is φ = 65288496.

The previous prime is 70729207. The next prime is 70729249. The reversal of 70729217 is 71292707.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71292707 = 311 ⋅229237.

It can be written as a sum of positive squares in 2 ways, for example, as 38056561 + 32672656 = 6169^2 + 5716^2 .

It is not a de Polignac number, because 70729217 - 2⁸ = 70728961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70729207) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2720342 + ... + 2720367.

It is an arithmetic number, because the mean of its divisors is an integer number (19042485).

Almost surely, 2^70729217 is an apocalyptic number.

It is an amenable number.

70729217 is a deficient number, since it is larger than the sum of its proper divisors (5440723).

70729217 is a wasteful number, since it uses less digits than its factorization.

70729217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5440722.

The product of its (nonzero) digits is 12348, while the sum is 35.

The square root of 70729217 is about 8410.0664087747. The cubic root of 70729217 is about 413.5546897208.

The spelling of 70729217 in words is "seventy million, seven hundred twenty-nine thousand, two hundred seventeen".