2621989440 has 336 divisors, whose sum is σ = 10690872192. Its totient is φ = 599187456.

The previous prime is 2621989439. The next prime is 2621989463. The reversal of 2621989440 is 449891262.

It is a tau number, because it is divible by the number of its divisors (336).

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 541912 + ... + 546728.

It is an arithmetic number, because the mean of its divisors is an integer number (31818072).

Almost surely, 2^2621989440 is an apocalyptic number.

2621989440 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 2621989440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5345436096).

2621989440 is an abundant number, since it is smaller than the sum of its proper divisors (8068882752).

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

2621989440 is an equidigital number, since it uses as much as digits as its factorization.

2621989440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4856 (or 4834 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The square root of 2621989440 is about 51205.3653438778. The cubic root of 2621989440 is about 1378.9345272962.

The spelling of 2621989440 in words is "two billion, six hundred twenty-one million, nine hundred eighty-nine thousand, four hundred forty".