328866557820 has 48 divisors (see below), whose sum is σ = 933440434080. Its totient is φ = 86496408576.

The previous prime is 328866557791. The next prime is 328866557861. The reversal of 328866557820 is 28755668823.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37537465 + ... + 37546224.

It is an arithmetic number, because the mean of its divisors is an integer number (19446675710).

Almost surely, 2^328866557820 is an apocalyptic number.

328866557820 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

328866557820 is an abundant number, since it is smaller than the sum of its proper divisors (604573876260).

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

328866557820 is a wasteful number, since it uses less digits than its factorization.

328866557820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75083774 (or 75083772 counting only the distinct ones).

The product of its (nonzero) digits is 38707200, while the sum is 60.

The spelling of 328866557820 in words is "three hundred twenty-eight billion, eight hundred sixty-six million, five hundred fifty-seven thousand, eight hundred twenty".