2581723548 has 72 divisors (see below), whose sum is σ = 6632882256. Its totient is φ = 846547200.

The previous prime is 2581723517. The next prime is 2581723567. The reversal of 2581723548 is 8453271852.

2581723548 is a `hidden beast` number, since 2 + 5 + 81 + 7 + 23 + 548 = 666.

It is a congruent number.

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, 1210443 + ... + 1212573.

Almost surely, 2^2581723548 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 2581723548, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3316441128).

2581723548 is an abundant number, since it is smaller than the sum of its proper divisors (4051158708).

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

2581723548 is a wasteful number, since it uses less digits than its factorization.

2581723548 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2675 (or 2670 counting only the distinct ones).

The product of its digits is 537600, while the sum is 45.

The square root of 2581723548 is about 50810.6637232776. The cubic root of 2581723548 is about 1371.8393161246.

The spelling of 2581723548 in words is "two billion, five hundred eighty-one million, seven hundred twenty-three thousand, five hundred forty-eight".