628662778 has 8 divisors (see below), whose sum is σ = 943728480. Its totient is φ = 314086620.

The previous prime is 628662757. The next prime is 628662781. The reversal of 628662778 is 877266826.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 119158 + ... + 124321.

It is an arithmetic number, because the mean of its divisors is an integer number (117966060).

Almost surely, 2^628662778 is an apocalyptic number.

628662778 is a deficient number, since it is larger than the sum of its proper divisors (315065702).

628662778 is a wasteful number, since it uses less digits than its factorization.

628662778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244772.

The product of its digits is 2709504, while the sum is 52.

The square root of 628662778 is about 25073.1485458049. The cubic root of 628662778 is about 856.6549244825.

The spelling of 628662778 in words is "six hundred twenty-eight million, six hundred sixty-two thousand, seven hundred seventy-eight".