420516278 has 48 divisors (see below), whose sum is σ = 789769440. Its totient is φ = 164406528.

The previous prime is 420516259. The next prime is 420516311. The reversal of 420516278 is 872615024.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 209576 + ... + 211572.

It is an arithmetic number, because the mean of its divisors is an integer number (16453530).

Almost surely, 2^420516278 is an apocalyptic number.

420516278 is a deficient number, since it is larger than the sum of its proper divisors (369253162).

420516278 is a wasteful number, since it uses less digits than its factorization.

420516278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2121 (or 2108 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 420516278 is about 20506.4935569200. The cubic root of 420516278 is about 749.1939654622.

The spelling of 420516278 in words is "four hundred twenty million, five hundred sixteen thousand, two hundred seventy-eight".