17880578820 has 192 divisors, whose sum is σ = 60582816000. Its totient is φ = 4351767552.

The previous prime is 17880578803. The next prime is 17880578827. The reversal of 17880578820 is 2887508871.

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

It is not an unprimeable number, because it can be changed into a prime (17880578827) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 610471 + ... + 639089.

It is an arithmetic number, because the mean of its divisors is an integer number (315535500).

Almost surely, 2^17880578820 is an apocalyptic number.

17880578820 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 17880578820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30291408000).

17880578820 is an abundant number, since it is smaller than the sum of its proper divisors (42702237180).

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

17880578820 is a wasteful number, since it uses less digits than its factorization.

17880578820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28739 (or 28731 counting only the distinct ones).

The product of its (nonzero) digits is 2007040, while the sum is 54.

The spelling of 17880578820 in words is "seventeen billion, eight hundred eighty million, five hundred seventy-eight thousand, eight hundred twenty".