1601786988 has 288 divisors, whose sum is σ = 4755179520. Its totient is φ = 469048320.

The previous prime is 1601786981. The next prime is 1601786993. The reversal of 1601786988 is 8896871061.

It is a super-2 number, since 2×1601786988² = 5131443109852224288, which contains 22 as substring.

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 (1601786981) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 27148903 + ... + 27148961.

It is an arithmetic number, because the mean of its divisors is an integer number (16511040).

Almost surely, 2^1601786988 is an apocalyptic number.

1601786988 is a gapful number since it is divisible by the number (18) 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 1601786988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2377589760).

1601786988 is an abundant number, since it is smaller than the sum of its proper divisors (3153392532).

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

1601786988 is a wasteful number, since it uses less digits than its factorization.

1601786988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179 (or 165 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 54.

The square root of 1601786988 is about 40022.3311165154. The cubic root of 1601786988 is about 1170.0423653299.

The spelling of 1601786988 in words is "one billion, six hundred one million, seven hundred eighty-six thousand, nine hundred eighty-eight".