70309865 has 4 divisors (see below), whose sum is σ = 84371844. Its totient is φ = 56247888.

The previous prime is 70309831. The next prime is 70309901. The reversal of 70309865 is 56890307.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56890307 = 151 ⋅376757.

It can be written as a sum of positive squares in 2 ways, for example, as 10896601 + 59413264 = 3301^2 + 7708^2 .

It is a cyclic number.

It is not a de Polignac number, because 70309865 - 2⁸ = 70309609 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7030982 + ... + 7030991.

It is an arithmetic number, because the mean of its divisors is an integer number (21092961).

Almost surely, 2^70309865 is an apocalyptic number.

It is an amenable number.

70309865 is a deficient number, since it is larger than the sum of its proper divisors (14061979).

70309865 is a wasteful number, since it uses less digits than its factorization.

70309865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14061978.

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 70309865 is about 8385.0977931089. The cubic root of 70309865 is about 412.7357501492.

The spelling of 70309865 in words is "seventy million, three hundred nine thousand, eight hundred sixty-five".