2015065640 has 64 divisors (see below), whose sum is σ = 5247244800. Its totient is φ = 682126848.

The previous prime is 2015065631. The next prime is 2015065649. The reversal of 2015065640 is 465605102.

It is an interprime number because it is at equal distance from previous prime (2015065631) and next prime (2015065649).

It is not an unprimeable number, because it can be changed into a prime (2015065649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23429 + ... + 67668.

It is an arithmetic number, because the mean of its divisors is an integer number (81988200).

Almost surely, 2^2015065640 is an apocalyptic number.

2015065640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2015065640 is an abundant number, since it is smaller than the sum of its proper divisors (3232179160).

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

2015065640 is a wasteful number, since it uses less digits than its factorization.

2015065640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91194 (or 91190 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 2015065640 is about 44889.4825098263. The cubic root of 2015065640 is about 1263.0767255579.

The spelling of 2015065640 in words is "two billion, fifteen million, sixty-five thousand, six hundred forty".