70161898 has 4 divisors (see below), whose sum is σ = 105242850. Its totient is φ = 35080948.

The previous prime is 70161829. The next prime is 70161899. The reversal of 70161898 is 89816107.

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

It can be written as a sum of positive squares in only one way, i.e., 43256929 + 26904969 = 6577^2 + 5187^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 70161898.

It is not an unprimeable number, because it can be changed into a prime (70161899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17540473 + ... + 17540476.

Almost surely, 2^70161898 is an apocalyptic number.

70161898 is a deficient number, since it is larger than the sum of its proper divisors (35080952).

70161898 is a wasteful number, since it uses less digits than its factorization.

70161898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35080951.

The product of its (nonzero) digits is 24192, while the sum is 40.

The square root of 70161898 is about 8376.2699335683. The cubic root of 70161898 is about 412.4460128917.

The spelling of 70161898 in words is "seventy million, one hundred sixty-one thousand, eight hundred ninety-eight".