778247220 has 48 divisors (see below), whose sum is σ = 2293784640. Its totient is φ = 196609536.

The previous prime is 778247213. The next prime is 778247227. The reversal of 778247220 is 22742877.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (778247213) and next prime (778247227).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (778247227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 340197 + ... + 342476.

It is an arithmetic number, because the mean of its divisors is an integer number (47787180).

Almost surely, 2^778247220 is an apocalyptic number.

It is an amenable number.

778247220 is an abundant number, since it is smaller than the sum of its proper divisors (1515537420).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

778247220 is a wasteful number, since it uses less digits than its factorization.

778247220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 682704 (or 682702 counting only the distinct ones).

The product of its (nonzero) digits is 87808, while the sum is 39.

The square root of 778247220 is about 27897.0826431726. The cubic root of 778247220 is about 919.8263771287.

The spelling of 778247220 in words is "seven hundred seventy-eight million, two hundred forty-seven thousand, two hundred twenty".