651633220 has 48 divisors (see below), whose sum is σ = 1565585280. Its totient is φ = 223179264.

The previous prime is 651633209. The next prime is 651633221. The reversal of 651633220 is 22336156.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (651633221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 174412 + ... + 178108.

It is an arithmetic number, because the mean of its divisors is an integer number (32616360).

Almost surely, 2^651633220 is an apocalyptic number.

It is an amenable number.

651633220 is an abundant number, since it is smaller than the sum of its proper divisors (913952060).

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

651633220 is a wasteful number, since it uses less digits than its factorization.

651633220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4972 (or 4970 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 28.

The square root of 651633220 is about 25527.1075525607. The cubic root of 651633220 is about 866.9640159836.

Adding to 651633220 its reverse (22336156), we get a palindrome (673969376).

The spelling of 651633220 in words is "six hundred fifty-one million, six hundred thirty-three thousand, two hundred twenty".