651278228 has 12 divisors (see below), whose sum is σ = 1206780372. Its totient is φ = 306483840.

The previous prime is 651278227. The next prime is 651278239. The reversal of 651278228 is 822872156.

It can be written as a sum of positive squares in 2 ways, for example, as 207417604 + 443860624 = 14402^2 + 21068^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651278227) 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, 4788743 + ... + 4788878.

It is an arithmetic number, because the mean of its divisors is an integer number (100565031).

Almost surely, 2^651278228 is an apocalyptic number.

651278228 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

651278228 is a deficient number, since it is larger than the sum of its proper divisors (555502144).

651278228 is a wasteful number, since it uses less digits than its factorization.

651278228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9577642 (or 9577640 counting only the distinct ones).

The product of its digits is 107520, while the sum is 41.

The square root of 651278228 is about 25520.1533694451. The cubic root of 651278228 is about 866.8065546057.

The spelling of 651278228 in words is "six hundred fifty-one million, two hundred seventy-eight thousand, two hundred twenty-eight".