780012011 has 4 divisors (see below), whose sum is σ = 784369800. Its totient is φ = 775654224.

The previous prime is 780012007. The next prime is 780012067. The reversal of 780012011 is 110210087.

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

It is a cyclic number.

It is not a de Polignac number, because 780012011 - 2² = 780012007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (780015011) 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, 2178626 + ... + 2178983.

It is an arithmetic number, because the mean of its divisors is an integer number (196092450).

Almost surely, 2^780012011 is an apocalyptic number.

780012011 is a deficient number, since it is larger than the sum of its proper divisors (4357789).

780012011 is a wasteful number, since it uses less digits than its factorization.

780012011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4357788.

The product of its (nonzero) digits is 112, while the sum is 20.

The square root of 780012011 is about 27928.6951181039. The cubic root of 780012011 is about 920.5211331515.

Adding to 780012011 its reverse (110210087), we get a palindrome (890222098).

The spelling of 780012011 in words is "seven hundred eighty million, twelve thousand, eleven".