428331047 has 4 divisors (see below), whose sum is σ = 446954160. Its totient is φ = 409707936.

The previous prime is 428331037. The next prime is 428331049. The reversal of 428331047 is 740133824.

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 428331047 - 2¹⁶ = 428265511 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428331049) 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, 9311522 + ... + 9311567.

It is an arithmetic number, because the mean of its divisors is an integer number (111738540).

Almost surely, 2^428331047 is an apocalyptic number.

428331047 is a deficient number, since it is larger than the sum of its proper divisors (18623113).

428331047 is a wasteful number, since it uses less digits than its factorization.

428331047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18623112.

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 428331047 is about 20696.1601994186. The cubic root of 428331047 is about 753.8064541559.

The spelling of 428331047 in words is "four hundred twenty-eight million, three hundred thirty-one thousand, forty-seven".