989778420 has 192 divisors, whose sum is σ = 3288418560. Its totient is φ = 246288384.

The previous prime is 989778407. The next prime is 989778421. The reversal of 989778420 is 24877989.

It is a super-2 number, since 2×989778420² = 1959322641395392800, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989778421) 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, 1257267 + ... + 1258053.

It is an arithmetic number, because the mean of its divisors is an integer number (17127180).

Almost surely, 2^989778420 is an apocalyptic number.

989778420 is a gapful number since it is divisible by the number (90) 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 989778420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1644209280).

989778420 is an abundant number, since it is smaller than the sum of its proper divisors (2298640140).

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

989778420 is a wasteful number, since it uses less digits than its factorization.

989778420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 959 (or 951 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 54.

The square root of 989778420 is about 31460.7441107168. The cubic root of 989778420 is about 996.5811313243.

The spelling of 989778420 in words is "nine hundred eighty-nine million, seven hundred seventy-eight thousand, four hundred twenty".