2978538156 has 120 divisors (see below), whose sum is σ = 8768686080. Its totient is φ = 873439200.

The previous prime is 2978538139. The next prime is 2978538209. The reversal of 2978538156 is 6518358792.

2978538156 is a `hidden beast` number, since 2 + 97 + 8 + 538 + 15 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 97005 + ... + 123963.

It is an arithmetic number, because the mean of its divisors is an integer number (73072384).

Almost surely, 2^2978538156 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2978538156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4384343040).

2978538156 is an abundant number, since it is smaller than the sum of its proper divisors (5790147924).

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

2978538156 is a wasteful number, since it uses less digits than its factorization.

2978538156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27017 (or 27006 counting only the distinct ones).

The product of its digits is 3628800, while the sum is 54.

The square root of 2978538156 is about 54575.9851583093. The cubic root of 2978538156 is about 1438.8020766511.

The spelling of 2978538156 in words is "two billion, nine hundred seventy-eight million, five hundred thirty-eight thousand, one hundred fifty-six".