1601891280 has 240 divisors, whose sum is σ = 5899068864. Its totient is φ = 386334720.

The previous prime is 1601891257. The next prime is 1601891321. The reversal of 1601891280 is 821981061.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2035047 + ... + 2035833.

Almost surely, 2^1601891280 is an apocalyptic number.

1601891280 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 1601891280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2949534432).

1601891280 is an abundant number, since it is smaller than the sum of its proper divisors (4297177584).

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

1601891280 is a wasteful number, since it uses less digits than its factorization.

1601891280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1074 (or 1065 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 36.

The square root of 1601891280 is about 40023.6340179150. The cubic root of 1601891280 is about 1170.0677585128.

The spelling of 1601891280 in words is "one billion, six hundred one million, eight hundred ninety-one thousand, two hundred eighty".