2078639391 has 8 divisors (see below), whose sum is σ = 2846425264. Its totient is φ = 1348306560.

The previous prime is 2078639371. The next prime is 2078639399. The reversal of 2078639391 is 1939368702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2078639391 - 2⁵ = 2078639359 is a prime.

It is a super-3 number, since 3×2078639391³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2078639391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2078639399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9363130 + ... + 9363351.

It is an arithmetic number, because the mean of its divisors is an integer number (355803158).

Almost surely, 2^2078639391 is an apocalyptic number.

2078639391 is a deficient number, since it is larger than the sum of its proper divisors (767785873).

2078639391 is a wasteful number, since it uses less digits than its factorization.

2078639391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18726521.

The product of its (nonzero) digits is 489888, while the sum is 48.

The square root of 2078639391 is about 45592.0979008424. The cubic root of 2078639391 is about 1276.2224627523. Note that the first 3 decimals are identical.

The spelling of 2078639391 in words is "two billion, seventy-eight million, six hundred thirty-nine thousand, three hundred ninety-one".