2158781248 has 28 divisors (see below), whose sum is σ = 4613358820. Its totient is φ = 996360192.

The previous prime is 2158781231. The next prime is 2158781249. The reversal of 2158781248 is 8421878512.

It can be written as a sum of positive squares in 2 ways, for example, as 1374333184 + 784448064 = 37072^2 + 28008^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2158781198 and 2158781207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2158781249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1296513 + ... + 1298176.

It is an arithmetic number, because the mean of its divisors is an integer number (164762815).

Almost surely, 2^2158781248 is an apocalyptic number.

It is an amenable number.

2158781248 is an abundant number, since it is smaller than the sum of its proper divisors (2454577572).

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

2158781248 is a wasteful number, since it uses less digits than its factorization.

2158781248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2594714 (or 2594704 counting only the distinct ones).

The product of its digits is 286720, while the sum is 46.

The square root of 2158781248 is about 46462.6866205561. The cubic root of 2158781248 is about 1292.4176459094.

The spelling of 2158781248 in words is "two billion, one hundred fifty-eight million, seven hundred eighty-one thousand, two hundred forty-eight".