87821978328 has 96 divisors (see below), whose sum is σ = 283778535600. Its totient is φ = 25091990784.

The previous prime is 87821978303. The next prime is 87821978329. The reversal of 87821978328 is 82387912878.

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

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87821978329) 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, 4138225 + ... + 4159392.

Almost surely, 2^87821978328 is an apocalyptic number.

It is an amenable number.

87821978328 is an abundant number, since it is smaller than the sum of its proper divisors (195956557272).

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

87821978328 is a wasteful number, since it uses less digits than its factorization.

87821978328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8297646 (or 8297629 counting only the distinct ones).

The product of its digits is 21676032, while the sum is 63.

The spelling of 87821978328 in words is "eighty-seven billion, eight hundred twenty-one million, nine hundred seventy-eight thousand, three hundred twenty-eight".