428787628 has 24 divisors (see below), whose sum is σ = 765293760. Its totient is φ = 210172560.

The previous prime is 428787613. The next prime is 428787641. The reversal of 428787628 is 826787824.

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, 38563 + ... + 48421.

It is an arithmetic number, because the mean of its divisors is an integer number (31887240).

Almost surely, 2^428787628 is an apocalyptic number.

It is an amenable number.

428787628 is a deficient number, since it is larger than the sum of its proper divisors (336506132).

428787628 is a wasteful number, since it uses less digits than its factorization.

428787628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10077 (or 10075 counting only the distinct ones).

The product of its digits is 2408448, while the sum is 52.

The square root of 428787628 is about 20707.1878341797. The cubic root of 428787628 is about 754.0741999321.

The spelling of 428787628 in words is "four hundred twenty-eight million, seven hundred eighty-seven thousand, six hundred twenty-eight".