2581403328 has 84 divisors (see below), whose sum is σ = 8456157840. Its totient is φ = 737542656.

The previous prime is 2581403317. The next prime is 2581403351. The reversal of 2581403328 is 8233041852.

2581403328 is a `hidden beast` number, since 2 + 581 + 40 + 3 + 32 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (84).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 2581403292 and 2581403301.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 316083 + ... + 324146.

Almost surely, 2^2581403328 is an apocalyptic number.

2581403328 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

2581403328 is an abundant number, since it is smaller than the sum of its proper divisors (5874754512).

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

2581403328 is a wasteful number, since it uses less digits than its factorization.

2581403328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640254 (or 640241 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

The square root of 2581403328 is about 50807.5125153751. The cubic root of 2581403328 is about 1371.7825958057.

The spelling of 2581403328 in words is "two billion, five hundred eighty-one million, four hundred three thousand, three hundred twenty-eight".