2145497880 has 128 divisors (see below), whose sum is σ = 6553612800. Its totient is φ = 561792000.

The previous prime is 2145497863. The next prime is 2145497987. The reversal of 2145497880 is 887945412.

It is a happy number.

It is a super-2 number, since 2×2145497880² = 9206322306168988800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3569580 + ... + 3570180.

It is an arithmetic number, because the mean of its divisors is an integer number (51200100).

Almost surely, 2^2145497880 is an apocalyptic number.

2145497880 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 2145497880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3276806400).

2145497880 is an abundant number, since it is smaller than the sum of its proper divisors (4408114920).

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

2145497880 is a wasteful number, since it uses less digits than its factorization.

2145497880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1105 (or 1101 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 48.

The square root of 2145497880 is about 46319.5194275588. The cubic root of 2145497880 is about 1289.7613644270.

The spelling of 2145497880 in words is "two billion, one hundred forty-five million, four hundred ninety-seven thousand, eight hundred eighty".