1278628630 has 8 divisors (see below), whose sum is σ = 2301531552. Its totient is φ = 511451448.

The previous prime is 1278628601. The next prime is 1278628643. The reversal of 1278628630 is 368268721.

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

It is a congruent number.

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, 63931422 + ... + 63931441.

It is an arithmetic number, because the mean of its divisors is an integer number (287691444).

Almost surely, 2^1278628630 is an apocalyptic number.

1278628630 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1278628630 is a deficient number, since it is larger than the sum of its proper divisors (1022902922).

1278628630 is a wasteful number, since it uses less digits than its factorization.

1278628630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127862870.

The product of its (nonzero) digits is 193536, while the sum is 43.

The square root of 1278628630 is about 35757.9170254644. The cubic root of 1278628630 is about 1085.3791506926.

The spelling of 1278628630 in words is "one billion, two hundred seventy-eight million, six hundred twenty-eight thousand, six hundred thirty".