2576816640 has 240 divisors, whose sum is σ = 9024063048. Its totient is φ = 679477248.

The previous prime is 2576816639. The next prime is 2576816719. The reversal of 2576816640 is 466186752.

2576816640 is a `hidden beast` number, since 2 + 576 + 8 + 16 + 64 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 2299394304 + 277422336 = 47952^2 + 16656^2 .

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 (45).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2234304 + ... + 2235456.

Almost surely, 2^2576816640 is an apocalyptic number.

2576816640 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 2576816640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4512031524).

2576816640 is an abundant number, since it is smaller than the sum of its proper divisors (6447246408).

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

2576816640 is a wasteful number, since it uses less digits than its factorization.

2576816640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1279 (or 1260 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The square root of 2576816640 is about 50762.3545553198. The cubic root of 2576816640 is about 1370.9696440632.

The spelling of 2576816640 in words is "two billion, five hundred seventy-six million, eight hundred sixteen thousand, six hundred forty".