651068820 has 384 divisors, whose sum is σ = 2322432000. Its totient is φ = 150543360.

The previous prime is 651068819. The next prime is 651068827. The reversal of 651068820 is 28860156.

It is a happy number.

651068820 is a `hidden beast` number, since 6 + 510 + 68 + 82 + 0 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651068827) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 7315336 + ... + 7315424.

It is an arithmetic number, because the mean of its divisors is an integer number (6048000).

Almost surely, 2^651068820 is an apocalyptic number.

651068820 is a gapful number since it is divisible by the number (60) 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 651068820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1161216000).

651068820 is an abundant number, since it is smaller than the sum of its proper divisors (1671363180).

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

651068820 is a wasteful number, since it uses less digits than its factorization.

651068820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180 (or 172 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 651068820 is about 25516.0502429353. The cubic root of 651068820 is about 866.7136420955.

The spelling of 651068820 in words is "six hundred fifty-one million, sixty-eight thousand, eight hundred twenty".