70018650 has 72 divisors (see below), whose sum is σ = 202604220. Its totient is φ = 17233920.

The previous prime is 70018639. The next prime is 70018651. The reversal of 70018650 is 5681007.

70018650 is a `hidden beast` number, since 7 + 0 + 0 + 1 + 8 + 650 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 2893401 + 67125249 = 1701^2 + 8193^2 .

It is a super-2 number, since 2×70018650² = 9805222695645000, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (70018651) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 135 + ... + 11834.

Almost surely, 2^70018650 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 70018650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101302110).

70018650 is an abundant number, since it is smaller than the sum of its proper divisors (132585570).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

70018650 is a wasteful number, since it uses less digits than its factorization.

70018650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12000 (or 11992 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 70018650 is about 8367.7147417918. The cubic root of 70018650 is about 412.1651276693.

Adding to 70018650 its reverse (5681007), we get a palindrome (75699657).

It can be divided in two parts, 7001 and 8650, that added together give a palindrome (15651).

The spelling of 70018650 in words is "seventy million, eighteen thousand, six hundred fifty".