778401485 has 8 divisors (see below), whose sum is σ = 934592256. Its totient is φ = 622380880.

The previous prime is 778401461. The next prime is 778401487. The reversal of 778401485 is 584104877.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-778401485 is a prime.

It is a super-3 number, since 3×778401485³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (778401487) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32249 + ... + 50958.

It is an arithmetic number, because the mean of its divisors is an integer number (116824032).

Almost surely, 2^778401485 is an apocalyptic number.

It is an amenable number.

778401485 is a deficient number, since it is larger than the sum of its proper divisors (156190771).

778401485 is a wasteful number, since it uses less digits than its factorization.

778401485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85083.

The product of its (nonzero) digits is 250880, while the sum is 44.

The square root of 778401485 is about 27899.8474010164. The cubic root of 778401485 is about 919.8871494377.

The spelling of 778401485 in words is "seven hundred seventy-eight million, four hundred one thousand, four hundred eighty-five".