427777820 has 12 divisors (see below), whose sum is σ = 898333464. Its totient is φ = 171111120.

The previous prime is 427777807. The next prime is 427777829. The reversal of 427777820 is 28777724.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (427777829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10694426 + ... + 10694465.

It is an arithmetic number, because the mean of its divisors is an integer number (74861122).

Almost surely, 2^427777820 is an apocalyptic number.

It is an amenable number.

427777820 is an abundant number, since it is smaller than the sum of its proper divisors (470555644).

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

427777820 is a wasteful number, since it uses less digits than its factorization.

427777820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21388900 (or 21388898 counting only the distinct ones).

The product of its (nonzero) digits is 307328, while the sum is 44.

The square root of 427777820 is about 20682.7904306938. The cubic root of 427777820 is about 753.4817786843.

The spelling of 427777820 in words is "four hundred twenty-seven million, seven hundred seventy-seven thousand, eight hundred twenty".