2015256144 has 80 divisors (see below), whose sum is σ = 5704081344. Its totient is φ = 608025600.

The previous prime is 2015256127. The next prime is 2015256151. The reversal of 2015256144 is 4416525102.

It is a super-2 number, since 2×2015256144² = 8122514651859497472, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 114834 + ... + 131214.

Almost surely, 2^2015256144 is an apocalyptic number.

2015256144 is a gapful number since it is divisible by the number (24) 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 2015256144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2852040672).

2015256144 is an abundant number, since it is smaller than the sum of its proper divisors (3688825200).

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

2015256144 is a wasteful number, since it uses less digits than its factorization.

2015256144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16636 (or 16630 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 30.

The square root of 2015256144 is about 44891.6043821114. The cubic root of 2015256144 is about 1263.1165279976.

The spelling of 2015256144 in words is "two billion, fifteen million, two hundred fifty-six thousand, one hundred forty-four".