2665389280 has 96 divisors (see below), whose sum is σ = 6395868864. Its totient is φ = 1049542656.

The previous prime is 2665389257. The next prime is 2665389289. The reversal of 2665389280 is 829835662.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2665389289) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4081434 + ... + 4082086.

It is an arithmetic number, because the mean of its divisors is an integer number (66623634).

Almost surely, 2^2665389280 is an apocalyptic number.

2665389280 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 2665389280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3197934432).

2665389280 is an abundant number, since it is smaller than the sum of its proper divisors (3730479584).

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

2665389280 is a wasteful number, since it uses less digits than its factorization.

2665389280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1028 (or 1020 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 49.

The square root of 2665389280 is about 51627.4082247017. The cubic root of 2665389280 is about 1386.5010907248.

The spelling of 2665389280 in words is "two billion, six hundred sixty-five million, three hundred eighty-nine thousand, two hundred eighty".