2015561280 has 56 divisors (see below), whose sum is σ = 6399410112. Its totient is φ = 537482752.

The previous prime is 2015561267. The next prime is 2015561311. The reversal of 2015561280 is 821655102.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1048812 + ... + 1050731.

Almost surely, 2^2015561280 is an apocalyptic number.

2015561280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2015561280 is an abundant number, since it is smaller than the sum of its proper divisors (4383848832).

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

2015561280 is a wasteful number, since it uses less digits than its factorization.

2015561280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2099563 (or 2099553 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 30.

The square root of 2015561280 is about 44895.0028399598. The cubic root of 2015561280 is about 1263.1802755391.

The spelling of 2015561280 in words is "two billion, fifteen million, five hundred sixty-one thousand, two hundred eighty".