2578015440 has 960 divisors, whose sum is σ = 12024230400. Its totient is φ = 487710720.

The previous prime is 2578015409. The next prime is 2578015457. The reversal of 2578015440 is 445108752.

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 = 2578015395 and 2578015404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 35315244 + ... + 35315316.

It is an arithmetic number, because the mean of its divisors is an integer number (12525240).

Almost surely, 2^2578015440 is an apocalyptic number.

2578015440 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 2578015440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6012115200).

2578015440 is an abundant number, since it is smaller than the sum of its proper divisors (9446214960).

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

2578015440 is a wasteful number, since it uses less digits than its factorization.

2578015440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137 (or 114 counting only the distinct ones).

The product of its (nonzero) digits is 44800, while the sum is 36.

The square root of 2578015440 is about 50774.1611452124. The cubic root of 2578015440 is about 1371.1822143047.

The spelling of 2578015440 in words is "two billion, five hundred seventy-eight million, fifteen thousand, four hundred forty".