780869849 has 4 divisors (see below), whose sum is σ = 814820736. Its totient is φ = 746918964.

The previous prime is 780869839. The next prime is 780869851. The reversal of 780869849 is 948968087.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 948968087 = 10079 ⋅94153.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-780869849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (780869839) 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, 16975409 + ... + 16975454.

It is an arithmetic number, because the mean of its divisors is an integer number (203705184).

Almost surely, 2^780869849 is an apocalyptic number.

It is an amenable number.

780869849 is a deficient number, since it is larger than the sum of its proper divisors (33950887).

780869849 is a wasteful number, since it uses less digits than its factorization.

780869849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33950886.

The product of its (nonzero) digits is 6967296, while the sum is 59.

The square root of 780869849 is about 27944.0485434734. The cubic root of 780869849 is about 920.8584650094.

The spelling of 780869849 in words is "seven hundred eighty million, eight hundred sixty-nine thousand, eight hundred forty-nine".