16870778820 has 240 divisors, whose sum is σ = 60600532608. Its totient is φ = 3848808960.

The previous prime is 16870778809. The next prime is 16870778843. The reversal of 16870778820 is 2887707861.

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

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 7834864 + ... + 7837016.

Almost surely, 2^16870778820 is an apocalyptic number.

16870778820 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 16870778820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30300266304).

16870778820 is an abundant number, since it is smaller than the sum of its proper divisors (43729753788).

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

16870778820 is a wasteful number, since it uses less digits than its factorization.

16870778820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2872 (or 2861 counting only the distinct ones).

The product of its (nonzero) digits is 2107392, while the sum is 54.

The spelling of 16870778820 in words is "sixteen billion, eight hundred seventy million, seven hundred seventy-eight thousand, eight hundred twenty".