651605420 has 12 divisors (see below), whose sum is σ = 1368371424. Its totient is φ = 260642160.

The previous prime is 651605419. The next prime is 651605429. The reversal of 651605420 is 24506156.

It is not an unprimeable number, because it can be changed into a prime (651605429) 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 3 ways as a sum of consecutive naturals, for example, 16290116 + ... + 16290155.

It is an arithmetic number, because the mean of its divisors is an integer number (114030952).

Almost surely, 2^651605420 is an apocalyptic number.

It is an amenable number.

651605420 is an abundant number, since it is smaller than the sum of its proper divisors (716766004).

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

651605420 is a wasteful number, since it uses less digits than its factorization.

651605420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32580280 (or 32580278 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 651605420 is about 25526.5630275601. The cubic root of 651605420 is about 866.9516869916.

The spelling of 651605420 in words is "six hundred fifty-one million, six hundred five thousand, four hundred twenty".