778028081 has 4 divisors (see below), whose sum is σ = 778558464. Its totient is φ = 777497700.

The previous prime is 778028063. The next prime is 778028089. The reversal of 778028081 is 180820877.

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.

It is a cyclic number.

It is not a de Polignac number, because 778028081 - 2¹⁴ = 778011697 is a prime.

It is a super-2 number, since 2×778028081² = 1210655389649085122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (778028089) 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, 262985 + ... + 265926.

It is an arithmetic number, because the mean of its divisors is an integer number (194639616).

Almost surely, 2^778028081 is an apocalyptic number.

It is an amenable number.

778028081 is a deficient number, since it is larger than the sum of its proper divisors (530383).

778028081 is a wasteful number, since it uses less digits than its factorization.

778028081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530382.

The product of its (nonzero) digits is 50176, while the sum is 41.

The square root of 778028081 is about 27893.1547337335. The cubic root of 778028081 is about 919.7400340621.

The spelling of 778028081 in words is "seven hundred seventy-eight million, twenty-eight thousand, eighty-one".