70872217 has 4 divisors (see below), whose sum is σ = 76323940. Its totient is φ = 65420496.

The previous prime is 70872203. The next prime is 70872227. The reversal of 70872217 is 71227807.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 41938576 + 28933641 = 6476^2 + 5379^2 .

It is a cyclic number.

It is not a de Polignac number, because 70872217 - 2⁷ = 70872089 is a prime.

It is a super-2 number, since 2×70872217² = 10045742284990178, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70872227) 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 3 ways as a sum of consecutive naturals, for example, 2725842 + ... + 2725867.

It is an arithmetic number, because the mean of its divisors is an integer number (19080985).

Almost surely, 2^70872217 is an apocalyptic number.

It is an amenable number.

70872217 is a deficient number, since it is larger than the sum of its proper divisors (5451723).

70872217 is a wasteful number, since it uses less digits than its factorization.

70872217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5451722.

The product of its (nonzero) digits is 10976, while the sum is 34.

The square root of 70872217 is about 8418.5638323885. The cubic root of 70872217 is about 413.8332097471.

The spelling of 70872217 in words is "seventy million, eight hundred seventy-two thousand, two hundred seventeen".