428867781 has 4 divisors (see below), whose sum is σ = 571823712. Its totient is φ = 285911852.

The previous prime is 428867741. The next prime is 428867801. The reversal of 428867781 is 187768824.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 428867781 - 2¹¹ = 428865733 is a prime.

It is a super-2 number, since 2×428867781² = 367855147159727922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428867741) 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, 71477961 + ... + 71477966.

It is an arithmetic number, because the mean of its divisors is an integer number (142955928).

Almost surely, 2^428867781 is an apocalyptic number.

It is an amenable number.

428867781 is a deficient number, since it is larger than the sum of its proper divisors (142955931).

428867781 is a wasteful number, since it uses less digits than its factorization.

428867781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142955930.

The product of its digits is 1204224, while the sum is 51.

The square root of 428867781 is about 20709.1231345028. The cubic root of 428867781 is about 754.1211832091.

The spelling of 428867781 in words is "four hundred twenty-eight million, eight hundred sixty-seven thousand, seven hundred eighty-one".