651223728 has 60 divisors (see below), whose sum is σ = 1861318368. Its totient is φ = 212453760.

The previous prime is 651223711. The next prime is 651223751. The reversal of 651223728 is 827322156.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 651223692 and 651223701.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 41343 + ... + 54878.

Almost surely, 2^651223728 is an apocalyptic number.

It is an amenable number.

651223728 is an abundant number, since it is smaller than the sum of its proper divisors (1210094640).

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

651223728 is a wasteful number, since it uses less digits than its factorization.

651223728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96282 (or 96273 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 651223728 is about 25519.0855635542. The cubic root of 651223728 is about 866.7823753466.

The spelling of 651223728 in words is "six hundred fifty-one million, two hundred twenty-three thousand, seven hundred twenty-eight".