18632778840 has 512 divisors, whose sum is σ = 68802048000. Its totient is φ = 4457576448.

The previous prime is 18632778823. The next prime is 18632778863. The reversal of 18632778840 is 4887723681.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 118680042 + ... + 118680198.

It is an arithmetic number, because the mean of its divisors is an integer number (134379000).

Almost surely, 2^18632778840 is an apocalyptic number.

18632778840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18632778840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34401024000).

18632778840 is an abundant number, since it is smaller than the sum of its proper divisors (50169269160).

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

18632778840 is a wasteful number, since it uses less digits than its factorization.

18632778840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376 (or 366 counting only the distinct ones).

The product of its (nonzero) digits is 3612672, while the sum is 54.

The spelling of 18632778840 in words is "eighteen billion, six hundred thirty-two million, seven hundred seventy-eight thousand, eight hundred forty".