420278500 has 24 divisors (see below), whose sum is σ = 917889336. Its totient is φ = 168111200.

The previous prime is 420278479. The next prime is 420278513. The reversal of 420278500 is 5872024.

It can be written as a sum of positive squares in 4 ways, for example, as 9972964 + 410305536 = 3158^2 + 20256^2 .

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 7 ways as a sum of consecutive naturals, for example, 419779 + ... + 420778.

It is an arithmetic number, because the mean of its divisors is an integer number (38245389).

Almost surely, 2^420278500 is an apocalyptic number.

It is an amenable number.

420278500 is an abundant number, since it is smaller than the sum of its proper divisors (497610836).

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

420278500 is a wasteful number, since it uses less digits than its factorization.

420278500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 840576 (or 840564 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 28.

The square root of 420278500 is about 20500.6951101664. The cubic root of 420278500 is about 749.0527300024.

The spelling of 420278500 in words is "four hundred twenty million, two hundred seventy-eight thousand, five hundred".