18764022240 has 144 divisors (see below), whose sum is σ = 66097938816. Its totient is φ = 4842316800.

The previous prime is 18764022217. The next prime is 18764022247. The reversal of 18764022240 is 4222046781.

18764022240 is a `hidden beast` number, since 1 + 8 + 7 + 6 + 402 + 2 + 240 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 18764022195 and 18764022204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18764022247) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 165531 + ... + 254810.

It is an arithmetic number, because the mean of its divisors is an integer number (459013464).

Almost surely, 2^18764022240 is an apocalyptic number.

18764022240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18764022240 is an abundant number, since it is smaller than the sum of its proper divisors (47333916576).

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

18764022240 is a wasteful number, since it uses less digits than its factorization.

18764022240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420393 (or 420382 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 36.

The spelling of 18764022240 in words is "eighteen billion, seven hundred sixty-four million, twenty-two thousand, two hundred forty".