428561556 has 48 divisors (see below), whose sum is σ = 1013472768. Its totient is φ = 140940000.

The previous prime is 428561543. The next prime is 428561563. The reversal of 428561556 is 655165824.

It is a super-2 number, since 2×428561556² = 367330014562282272, which contains 22 as substring.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 294631 + ... + 296081.

It is an arithmetic number, because the mean of its divisors is an integer number (21114016).

Almost surely, 2^428561556 is an apocalyptic number.

It is an amenable number.

428561556 is an abundant number, since it is smaller than the sum of its proper divisors (584911212).

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

428561556 is a wasteful number, since it uses less digits than its factorization.

428561556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1772 (or 1770 counting only the distinct ones).

The product of its digits is 288000, while the sum is 42.

The square root of 428561556 is about 20701.7283336440. The cubic root of 428561556 is about 753.9416517736.

The spelling of 428561556 in words is "four hundred twenty-eight million, five hundred sixty-one thousand, five hundred fifty-six".