780138799 has 4 divisors (see below), whose sum is σ = 851060520. Its totient is φ = 709217080.

The previous prime is 780138791. The next prime is 780138851. The reversal of 780138799 is 997831087.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 780138799 - 2³ = 780138791 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (780138791) 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, 35460844 + ... + 35460865.

It is an arithmetic number, because the mean of its divisors is an integer number (212765130).

Almost surely, 2^780138799 is an apocalyptic number.

780138799 is a deficient number, since it is larger than the sum of its proper divisors (70921721).

780138799 is a wasteful number, since it uses less digits than its factorization.

780138799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70921720.

The product of its (nonzero) digits is 762048, while the sum is 52.

The square root of 780138799 is about 27930.9648777123. The cubic root of 780138799 is about 920.5710061914.

The spelling of 780138799 in words is "seven hundred eighty million, one hundred thirty-eight thousand, seven hundred ninety-nine".