651537648 has 160 divisors (see below), whose sum is σ = 2007014400. Its totient is φ = 201636864.

The previous prime is 651537611. The next prime is 651537671. The reversal of 651537648 is 846735156.

651537648 is a `hidden beast` number, since 6 + 51 + 537 + 64 + 8 = 666.

It is a super-2 number, since 2×651537648² = 849002613522743808, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 579615 + ... + 580737.

It is an arithmetic number, because the mean of its divisors is an integer number (12543840).

Almost surely, 2^651537648 is an apocalyptic number.

651537648 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 651537648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1003507200).

651537648 is an abundant number, since it is smaller than the sum of its proper divisors (1355476752).

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

651537648 is a wasteful number, since it uses less digits than its factorization.

651537648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1236 (or 1224 counting only the distinct ones).

The product of its digits is 604800, while the sum is 45.

The square root of 651537648 is about 25525.2355131153. The cubic root of 651537648 is about 866.9216293907.

The spelling of 651537648 in words is "six hundred fifty-one million, five hundred thirty-seven thousand, six hundred forty-eight".