778642226 has 8 divisors (see below), whose sum is σ = 1171950444. Its totient is φ = 387992080.

The previous prime is 778642223. The next prime is 778642231. The reversal of 778642226 is 622246877.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 530611225 + 248031001 = 23035^2 + 15749^2 .

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

It is a super-2 number, since 2×778642226² = 1212567432220470152, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (778642223) 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, 663785 + ... + 664956.

Almost surely, 2^778642226 is an apocalyptic number.

778642226 is a deficient number, since it is larger than the sum of its proper divisors (393308218).

778642226 is a wasteful number, since it uses less digits than its factorization.

778642226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1329036.

The product of its digits is 451584, while the sum is 44.

The square root of 778642226 is about 27904.1614459206. The cubic root of 778642226 is about 919.9819727091.

The spelling of 778642226 in words is "seven hundred seventy-eight million, six hundred forty-two thousand, two hundred twenty-six".