651349944 has 384 divisors, whose sum is σ = 2298240000. Its totient is φ = 169827840.

The previous prime is 651349943. The next prime is 651349973. The reversal of 651349944 is 449943156.

651349944 is a `hidden beast` number, since 6 + 513 + 4 + 99 + 44 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 651349944.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651349943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 8244897 + ... + 8244975.

It is an arithmetic number, because the mean of its divisors is an integer number (5985000).

Almost surely, 2^651349944 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 651349944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1149120000).

651349944 is an abundant number, since it is smaller than the sum of its proper divisors (1646890056).

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

651349944 is a wasteful number, since it uses less digits than its factorization.

651349944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168 (or 151 counting only the distinct ones).

The product of its digits is 466560, while the sum is 45.

The square root of 651349944 is about 25521.5584163663. The cubic root of 651349944 is about 866.8383697934.

It can be divided in two parts, 65134 and 9944, that added together give a triangular number (75078 = T₃₈₇).

The spelling of 651349944 in words is "six hundred fifty-one million, three hundred forty-nine thousand, nine hundred forty-four".