2578265536 has 168 divisors, whose sum is σ = 6704819712. Its totient is φ = 971712000.

The previous prime is 2578265497. The next prime is 2578265539. The reversal of 2578265536 is 6355628752.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a self number, because there is not a number n which added to its sum of digits gives 2578265536.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2578265539) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1068171 + ... + 1070581.

Almost surely, 2^2578265536 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2578265536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3352409856).

2578265536 is an abundant number, since it is smaller than the sum of its proper divisors (4126554176).

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

2578265536 is a wasteful number, since it uses less digits than its factorization.

2578265536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2479 (or 2462 counting only the distinct ones).

The product of its digits is 3024000, while the sum is 49.

The square root of 2578265536 is about 50776.6239129779. The cubic root of 2578265536 is about 1371.2265528158.

It can be divided in two parts, 257826 and 5536, that added together give a palindrome (263362).

The spelling of 2578265536 in words is "two billion, five hundred seventy-eight million, two hundred sixty-five thousand, five hundred thirty-six".