651078648 has 256 divisors, whose sum is σ = 2125440000. Its totient is φ = 184757760.

The previous prime is 651078619. The next prime is 651078667. The reversal of 651078648 is 846870156.

It is a happy number.

651078648 is a `hidden beast` number, since 6 + 510 + 78 + 64 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3271653 + ... + 3271851.

It is an arithmetic number, because the mean of its divisors is an integer number (8302500).

Almost surely, 2^651078648 is an apocalyptic number.

651078648 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 651078648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1062720000).

651078648 is an abundant number, since it is smaller than the sum of its proper divisors (1474361352).

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

651078648 is a wasteful number, since it uses less digits than its factorization.

651078648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254 (or 232 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 45.

The square root of 651078648 is about 25516.2428268740. The cubic root of 651078648 is about 866.7180031392.

It can be divided in two parts, 6510 and 78648, that added together give a palindrome (85158).

The spelling of 651078648 in words is "six hundred fifty-one million, seventy-eight thousand, six hundred forty-eight".