428687500 has 84 divisors (see below), whose sum is σ = 989831080. Its totient is φ = 162450000.

The previous prime is 428687491. The next prime is 428687503. The reversal of 428687500 is 5786824.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is not an unprimeable number, because it can be changed into a prime (428687503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 22562491 + ... + 22562509.

Almost surely, 2^428687500 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 428687500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (494915540).

428687500 is an abundant number, since it is smaller than the sum of its proper divisors (561143580).

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

428687500 is an frugal number, since it uses more digits than its factorization.

428687500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91 (or 26 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 40.

The square root of 428687500 is about 20704.7699818182. The cubic root of 428687500 is about 754.0154996849.

The spelling of 428687500 in words is "four hundred twenty-eight million, six hundred eighty-seven thousand, five hundred".