280601640 has 192 divisors, whose sum is σ = 1012564800. Its totient is φ = 66816000.

The previous prime is 280601597. The next prime is 280601641. The reversal of 280601640 is 46106082.

It is not an unprimeable number, because it can be changed into a prime (280601641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 233040 + ... + 234240.

It is an arithmetic number, because the mean of its divisors is an integer number (5273775).

Almost surely, 2^280601640 is an apocalyptic number.

280601640 is a gapful number since it is divisible by the number (20) 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 280601640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (506282400).

280601640 is an abundant number, since it is smaller than the sum of its proper divisors (731963160).

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

280601640 is a wasteful number, since it uses less digits than its factorization.

280601640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1288 (or 1281 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 280601640 is about 16751.1683174637. The cubic root of 280601640 is about 654.6814992890.

The spelling of 280601640 in words is "two hundred eighty million, six hundred one thousand, six hundred forty".