32647978818 has 144 divisors (see below), whose sum is σ = 88940078136. Its totient is φ = 8578967040.

The previous prime is 32647978813. The next prime is 32647978823. The reversal of 32647978818 is 81887974623.

It is an interprime number because it is at equal distance from previous prime (32647978813) and next prime (32647978823).

It can be written as a sum of positive squares in 4 ways, for example, as 29098559889 + 3549418929 = 170583^2 + 59577^2 .

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (32647978813) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 3216880 + ... + 3227012.

Almost surely, 2^32647978818 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 32647978818, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44470039068).

32647978818 is an abundant number, since it is smaller than the sum of its proper divisors (56292099318).

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

32647978818 is a wasteful number, since it uses less digits than its factorization.

32647978818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10449 (or 10439 counting only the distinct ones).

The product of its digits is 32514048, while the sum is 63.

The spelling of 32647978818 in words is "thirty-two billion, six hundred forty-seven million, nine hundred seventy-eight thousand, eight hundred eighteen".