18405070240 has 24 divisors (see below), whose sum is σ = 43481978820. Its totient is φ = 7362028032.

The previous prime is 18405070207. The next prime is 18405070241. The reversal of 18405070240 is 4207050481.

It can be written as a sum of positive squares in 2 ways, for example, as 18161335696 + 243734544 = 134764^2 + 15612^2 .

It is a super-2 number, since 2×18405070240² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18405070241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57515685 + ... + 57516004.

Almost surely, 2^18405070240 is an apocalyptic number.

18405070240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18405070240 is an abundant number, since it is smaller than the sum of its proper divisors (25076908580).

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

18405070240 is a wasteful number, since it uses less digits than its factorization.

18405070240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115031704 (or 115031696 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 31.

The spelling of 18405070240 in words is "eighteen billion, four hundred five million, seventy thousand, two hundred forty".