651868420 has 24 divisors (see below), whose sum is σ = 1564484544. Its totient is φ = 223497696.

The previous prime is 651868367. The next prime is 651868453. The reversal of 651868420 is 24868156.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2327962 + ... + 2328241.

It is an arithmetic number, because the mean of its divisors is an integer number (65186856).

Almost surely, 2^651868420 is an apocalyptic number.

It is an amenable number.

651868420 is an abundant number, since it is smaller than the sum of its proper divisors (912616124).

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

651868420 is a wasteful number, since it uses less digits than its factorization.

651868420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4656219 (or 4656217 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 40.

The square root of 651868420 is about 25531.7140043515. The cubic root of 651868420 is about 867.0683105480.

The spelling of 651868420 in words is "six hundred fifty-one million, eight hundred sixty-eight thousand, four hundred twenty".