70218491 has 8 divisors (see below), whose sum is σ = 80828160. Its totient is φ = 59753448.

The previous prime is 70218487. The next prime is 70218497. The reversal of 70218491 is 19481207.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 70218491 - 2² = 70218487 is a prime.

It is not an unprimeable number, because it can be changed into a prime (70218497) 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 7 ways as a sum of consecutive naturals, for example, 35111 + ... + 37056.

It is an arithmetic number, because the mean of its divisors is an integer number (10103520).

Almost surely, 2^70218491 is an apocalyptic number.

70218491 is a deficient number, since it is larger than the sum of its proper divisors (10609669).

70218491 is a wasteful number, since it uses less digits than its factorization.

70218491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72313.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 70218491 is about 8379.6474269506. The cubic root of 70218491 is about 412.5568768833.

Adding to 70218491 its reverse (19481207), we get a palindrome (89699698).

The spelling of 70218491 in words is "seventy million, two hundred eighteen thousand, four hundred ninety-one".