18628740405 has 96 divisors (see below), whose sum is σ = 36820023552. Its totient is φ = 8624563200.

The previous prime is 18628740397. The next prime is 18628740409. The reversal of 18628740405 is 50404782681.

18628740405 is a `hidden beast` number, since 18 + 628 + 7 + 4 + 0 + 4 + 0 + 5 = 666.

It is not a de Polignac number, because 18628740405 - 2³ = 18628740397 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18628740409) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 9346089 + ... + 9348081.

It is an arithmetic number, because the mean of its divisors is an integer number (383541912).

Almost surely, 2^18628740405 is an apocalyptic number.

18628740405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18628740405 is a deficient number, since it is larger than the sum of its proper divisors (18191283147).

18628740405 is a wasteful number, since it uses less digits than its factorization.

18628740405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2859 (or 2856 counting only the distinct ones).

The product of its (nonzero) digits is 430080, while the sum is 45.

The spelling of 18628740405 in words is "eighteen billion, six hundred twenty-eight million, seven hundred forty thousand, four hundred five".