780028994 has 4 divisors (see below), whose sum is σ = 1170043494. Its totient is φ = 390014496.

The previous prime is 780028981. The next prime is 780028999. The reversal of 780028994 is 499820087.

780028994 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in only one way, i.e., 739132969 + 40896025 = 27187^2 + 6395^2 .

It is not an unprimeable number, because it can be changed into a prime (780028999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195007247 + ... + 195007250.

Almost surely, 2^780028994 is an apocalyptic number.

780028994 is a deficient number, since it is larger than the sum of its proper divisors (390014500).

780028994 is a wasteful number, since it uses less digits than its factorization.

780028994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390014499.

The product of its (nonzero) digits is 290304, while the sum is 47.

The square root of 780028994 is about 27928.9991585807. Note that the first 3 decimals coincide. The cubic root of 780028994 is about 920.5278138593.

Adding to 780028994 its sum of digits (47), we get a square (780029041 = 27929²).

The spelling of 780028994 in words is "seven hundred eighty million, twenty-eight thousand, nine hundred ninety-four".