2015640340 has 48 divisors (see below), whose sum is σ = 4840303104. Its totient is φ = 690681600.

The previous prime is 2015640337. The next prime is 2015640349. The reversal of 2015640340 is 430465102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2015640349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 350085 + ... + 355795.

It is an arithmetic number, because the mean of its divisors is an integer number (100839648).

Almost surely, 2^2015640340 is an apocalyptic number.

2015640340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2015640340 is an abundant number, since it is smaller than the sum of its proper divisors (2824662764).

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

2015640340 is a wasteful number, since it uses less digits than its factorization.

2015640340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8248 (or 8246 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 2015640340 is about 44895.8833302119. The cubic root of 2015640340 is about 1263.1967913236.

The spelling of 2015640340 in words is "two billion, fifteen million, six hundred forty thousand, three hundred forty".