2615138988 has 48 divisors (see below), whose sum is σ = 7607679744. Its totient is φ = 679256640.

The previous prime is 2615138963. The next prime is 2615138989. The reversal of 2615138988 is 8898315162.

It is a self number, because there is not a number n which added to its sum of digits gives 2615138988.

It is not an unprimeable number, because it can be changed into a prime (2615138989) 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, 1414195 + ... + 1416042.

It is an arithmetic number, because the mean of its divisors is an integer number (158493328).

Almost surely, 2^2615138988 is an apocalyptic number.

2615138988 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

2615138988 is an abundant number, since it is smaller than the sum of its proper divisors (4992540756).

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

2615138988 is a wasteful number, since it uses less digits than its factorization.

2615138988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2830262 (or 2830260 counting only the distinct ones).

The product of its digits is 829440, while the sum is 51.

The square root of 2615138988 is about 51138.4296591125. The cubic root of 2615138988 is about 1377.7325692984.

The spelling of 2615138988 in words is "two billion, six hundred fifteen million, one hundred thirty-eight thousand, nine hundred eighty-eight".