2015500000 has 168 divisors, whose sum is σ = 5167902600. Its totient is φ = 772800000.

The previous prime is 2015499973. The next prime is 2015500007. The reversal of 2015500000 is 55102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2015500007) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 14499931 + ... + 14500069.

It is an arithmetic number, because the mean of its divisors is an integer number (30761325).

Almost surely, 2^2015500000 is an apocalyptic number.

2015500000 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 2015500000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2583951300).

2015500000 is an abundant number, since it is smaller than the sum of its proper divisors (3152402600).

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

2015500000 is an frugal number, since it uses more digits than its factorization.

2015500000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208 (or 175 counting only the distinct ones).

The product of its (nonzero) digits is 50, while the sum is 13.

The square root of 2015500000 is about 44894.3203534701. The cubic root of 2015500000 is about 1263.1674737334.

Adding to 2015500000 its reverse (55102), we get a palindrome (2015555102).

The spelling of 2015500000 in words is "two billion, fifteen million, five hundred thousand".