70863665 has 4 divisors (see below), whose sum is σ = 85036404. Its totient is φ = 56690928.

The previous prime is 70863649. The next prime is 70863671. The reversal of 70863665 is 56636807.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56636807 = 53 ⋅1068619.

It can be written as a sum of positive squares in 2 ways, for example, as 13830961 + 57032704 = 3719^2 + 7552^2 .

It is a cyclic number.

It is not a de Polignac number, because 70863665 - 2⁴ = 70863649 is a prime.

It is a Duffinian number.

It is a Curzon 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, 7086362 + ... + 7086371.

It is an arithmetic number, because the mean of its divisors is an integer number (21259101).

Almost surely, 2^70863665 is an apocalyptic number.

It is an amenable number.

70863665 is a deficient number, since it is larger than the sum of its proper divisors (14172739).

70863665 is a wasteful number, since it uses less digits than its factorization.

70863665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14172738.

The product of its (nonzero) digits is 181440, while the sum is 41.

The square root of 70863665 is about 8418.0558919503. The cubic root of 70863665 is about 413.8165636192.

The spelling of 70863665 in words is "seventy million, eight hundred sixty-three thousand, six hundred sixty-five".