780020897 has 6 divisors (see below), whose sum is σ = 784000098. Its totient is φ = 776061792.

The previous prime is 780020869. The next prime is 780020929. The reversal of 780020897 is 798020087.

It can be written as a sum of positive squares in only one way, i.e., 532871056 + 247149841 = 23084^2 + 15721^2 .

It is not a de Polignac number, because 780020897 - 2¹² = 780016801 is a prime.

It is a super-3 number, since 3×780020897³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (780020867) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 29753 + ... + 49449.

It is an arithmetic number, because the mean of its divisors is an integer number (130666683).

Almost surely, 2^780020897 is an apocalyptic number.

It is an amenable number.

780020897 is a deficient number, since it is larger than the sum of its proper divisors (3979201).

780020897 is an equidigital number, since it uses as much as digits as its factorization.

780020897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20095 (or 19896 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 41.

The square root of 780020897 is about 27928.8542013452. The cubic root of 780020897 is about 920.5246287044.

The spelling of 780020897 in words is "seven hundred eighty million, twenty thousand, eight hundred ninety-seven".