2578774536 has 128 divisors (see below), whose sum is σ = 8049888000. Its totient is φ = 758951424.

The previous prime is 2578774529. The next prime is 2578774547. The reversal of 2578774536 is 6354778752.

It is a happy number.

2578774536 is a `hidden beast` number, since 25 + 7 + 87 + 7 + 4 + 536 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 44620 + ... + 84548.

It is an arithmetic number, because the mean of its divisors is an integer number (62889750).

Almost surely, 2^2578774536 is an apocalyptic number.

2578774536 is a gapful number since it is divisible by the number (26) 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 2578774536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4024944000).

2578774536 is an abundant number, since it is smaller than the sum of its proper divisors (5471113464).

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

2578774536 is a wasteful number, since it uses less digits than its factorization.

2578774536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39980 (or 39970 counting only the distinct ones).

The product of its digits is 9878400, while the sum is 54.

The square root of 2578774536 is about 50781.6358145344. The cubic root of 2578774536 is about 1371.3167825175.

The spelling of 2578774536 in words is "two billion, five hundred seventy-eight million, seven hundred seventy-four thousand, five hundred thirty-six".