2178139650 has 24 divisors (see below), whose sum is σ = 5401786704. Its totient is φ = 580837200.

The previous prime is 2178139609. The next prime is 2178139679. The reversal of 2178139650 is 569318712.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7260316 + ... + 7260615.

It is an arithmetic number, because the mean of its divisors is an integer number (225074446).

Almost surely, 2^2178139650 is an apocalyptic number.

2178139650 is an abundant number, since it is smaller than the sum of its proper divisors (3223647054).

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

2178139650 is a wasteful number, since it uses less digits than its factorization.

2178139650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14520946 (or 14520941 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 42.

The square root of 2178139650 is about 46670.5437079964. The cubic root of 2178139650 is about 1296.2693139352.

The spelling of 2178139650 in words is "two billion, one hundred seventy-eight million, one hundred thirty-nine thousand, six hundred fifty".