651520260 has 240 divisors, whose sum is σ = 2192984640. Its totient is φ = 161429760.

The previous prime is 651520253. The next prime is 651520267. The reversal of 651520260 is 62025156.

651520260 is a `hidden beast` number, since 651 + 5 + 2 + 0 + 2 + 6 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (651520253) and next prime (651520267).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (651520267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1877407 + ... + 1877753.

It is an arithmetic number, because the mean of its divisors is an integer number (9137436).

Almost surely, 2^651520260 is an apocalyptic number.

651520260 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 651520260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1096492320).

651520260 is an abundant number, since it is smaller than the sum of its proper divisors (1541464380).

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

651520260 is a wasteful number, since it uses less digits than its factorization.

651520260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 448 (or 437 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 651520260 is about 25524.8949067376. The cubic root of 651520260 is about 866.9139172923.

The spelling of 651520260 in words is "six hundred fifty-one million, five hundred twenty thousand, two hundred sixty".