651409880 has 64 divisors (see below), whose sum is σ = 1601614080. Its totient is φ = 236476800.

The previous prime is 651409873. The next prime is 651409883. The reversal of 651409880 is 88904156.

It is a super-2 number, since 2×651409880² = 848669663523228800, which contains 22 as substring.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651409883) 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 15 ways as a sum of consecutive naturals, for example, 424715 + ... + 426245.

It is an arithmetic number, because the mean of its divisors is an integer number (25025220).

Almost surely, 2^651409880 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 651409880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (800807040).

651409880 is an abundant number, since it is smaller than the sum of its proper divisors (950204200).

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

651409880 is a wasteful number, since it uses less digits than its factorization.

651409880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2520 (or 2516 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 41.

The square root of 651409880 is about 25522.7326123203. The cubic root of 651409880 is about 866.8649572581.

The spelling of 651409880 in words is "six hundred fifty-one million, four hundred nine thousand, eight hundred eighty".