651446864 has 30 divisors (see below), whose sum is σ = 1297256814. Its totient is φ = 316909440.

The previous prime is 651446843. The next prime is 651446867. The reversal of 651446864 is 468644156.

It can be written as a sum of positive squares in 3 ways, for example, as 502118464 + 149328400 = 22408^2 + 12220^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651446867) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7034 + ... + 36774.

Almost surely, 2^651446864 is an apocalyptic number.

It is an amenable number.

651446864 is a deficient number, since it is larger than the sum of its proper divisors (645809950).

651446864 is a wasteful number, since it uses less digits than its factorization.

651446864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29823 (or 29780 counting only the distinct ones).

The product of its digits is 552960, while the sum is 44.

The square root of 651446864 is about 25523.4571326065. The cubic root of 651446864 is about 866.8813624575.

The spelling of 651446864 in words is "six hundred fifty-one million, four hundred forty-six thousand, eight hundred sixty-four".