428581787 has 4 divisors (see below), whose sum is σ = 432513840. Its totient is φ = 424649736.

The previous prime is 428581763. The next prime is 428581799. The reversal of 428581787 is 787185824.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 428581787 - 2¹⁶ = 428516251 is a prime.

It is a super-2 number, since 2×428581787² = 367364696296226738, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (428581717) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1965863 + ... + 1966080.

It is an arithmetic number, because the mean of its divisors is an integer number (108128460).

Almost surely, 2^428581787 is an apocalyptic number.

428581787 is a deficient number, since it is larger than the sum of its proper divisors (3932053).

428581787 is a wasteful number, since it uses less digits than its factorization.

428581787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3932052.

The product of its digits is 1003520, while the sum is 50.

The square root of 428581787 is about 20702.2169585772. The cubic root of 428581787 is about 753.9535152997.

The spelling of 428581787 in words is "four hundred twenty-eight million, five hundred eighty-one thousand, seven hundred eighty-seven".