70663871 has 4 divisors (see below), whose sum is σ = 71350032. Its totient is φ = 69977712.

The previous prime is 70663867. The next prime is 70663877. The reversal of 70663871 is 17836607.

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

It is a cyclic number.

It is not a de Polignac number, because 70663871 - 2² = 70663867 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70663877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 342926 + ... + 343131.

It is an arithmetic number, because the mean of its divisors is an integer number (17837508).

Almost surely, 2^70663871 is an apocalyptic number.

70663871 is a deficient number, since it is larger than the sum of its proper divisors (686161).

70663871 is a wasteful number, since it uses less digits than its factorization.

70663871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 686160.

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 70663871 is about 8406.1805238765. The cubic root of 70663871 is about 413.4272908296.

The spelling of 70663871 in words is "seventy million, six hundred sixty-three thousand, eight hundred seventy-one".