2615814978 has 128 divisors (see below), whose sum is σ = 6387793920. Its totient is φ = 698068800.

The previous prime is 2615814977. The next prime is 2615814989. The reversal of 2615814978 is 8794185162.

2615814978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 2615814978.

It is not an unprimeable number, because it can be changed into a prime (2615814977) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 11523301 + ... + 11523527.

It is an arithmetic number, because the mean of its divisors is an integer number (49904640).

Almost surely, 2^2615814978 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2615814978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3193896960).

2615814978 is an abundant number, since it is smaller than the sum of its proper divisors (3771978942).

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

2615814978 is a wasteful number, since it uses less digits than its factorization.

2615814978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492.

The product of its digits is 967680, while the sum is 51.

The square root of 2615814978 is about 51145.0386450142. The cubic root of 2615814978 is about 1377.8512695801.

The spelling of 2615814978 in words is "two billion, six hundred fifteen million, eight hundred fourteen thousand, nine hundred seventy-eight".