218690040 has 64 divisors (see below), whose sum is σ = 694668960. Its totient is φ = 54886400.

The previous prime is 218690033. The next prime is 218690041. The reversal of 218690040 is 40096812.

218690040 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218690041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51561 + ... + 55640.

Almost surely, 2^218690040 is an apocalyptic number.

218690040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

218690040 is an abundant number, since it is smaller than the sum of its proper divisors (475978920).

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

218690040 is a wasteful number, since it uses less digits than its factorization.

218690040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107232 (or 107228 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 218690040 is about 14788.1723008626. The cubic root of 218690040 is about 602.4805087730.

The spelling of 218690040 in words is "two hundred eighteen million, six hundred ninety thousand, forty".