2138877078 has 64 divisors (see below), whose sum is σ = 4831323840. Its totient is φ = 626669568.

The previous prime is 2138877073. The next prime is 2138877109. The reversal of 2138877078 is 8707788312.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2138877078.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2138877073) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 158650 + ... + 171602.

It is an arithmetic number, because the mean of its divisors is an integer number (75489435).

Almost surely, 2^2138877078 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2138877078, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2415661920).

2138877078 is an abundant number, since it is smaller than the sum of its proper divisors (2692446762).

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

2138877078 is a wasteful number, since it uses less digits than its factorization.

2138877078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13073.

The product of its (nonzero) digits is 1053696, while the sum is 51.

The square root of 2138877078 is about 46247.9953943952. The cubic root of 2138877078 is about 1288.4333038455.

The spelling of 2138877078 in words is "two billion, one hundred thirty-eight million, eight hundred seventy-seven thousand, seventy-eight".