651698540 has 36 divisors (see below), whose sum is σ = 1401213744. Its totient is φ = 254602656.

The previous prime is 651698539. The next prime is 651698617. The reversal of 651698540 is 45896156.

It is a junction number, because it is equal to n+sod(n) for n = 651698491 and 651698500.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 28169 + ... + 45791.

It is an arithmetic number, because the mean of its divisors is an integer number (38922604).

Almost surely, 2^651698540 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 651698540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (700606872).

651698540 is an abundant number, since it is smaller than the sum of its proper divisors (749515204).

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

651698540 is a wasteful number, since it uses less digits than its factorization.

651698540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17718 (or 17673 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 44.

The square root of 651698540 is about 25528.3869447327. The cubic root of 651698540 is about 866.9929833002.

The spelling of 651698540 in words is "six hundred fifty-one million, six hundred ninety-eight thousand, five hundred forty".