428972869 has 6 divisors (see below), whose sum is σ = 464509266. Its totient is φ = 395974800.

The previous prime is 428972867. The next prime is 428972903. The reversal of 428972869 is 968279824.

It can be written as a sum of positive squares in 3 ways, for example, as 45400644 + 383572225 = 6738^2 + 19585^2 .

It is not a de Polignac number, because 428972869 - 2¹ = 428972867 is a prime.

It is a super-2 number, since 2×428972869² = 368035444676182322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428972867) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1268982 + ... + 1269319.

It is an arithmetic number, because the mean of its divisors is an integer number (77418211).

Almost surely, 2^428972869 is an apocalyptic number.

It is an amenable number.

428972869 is a deficient number, since it is larger than the sum of its proper divisors (35536397).

428972869 is a wasteful number, since it uses less digits than its factorization.

428972869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2538327 (or 2538314 counting only the distinct ones).

The product of its digits is 3483648, while the sum is 55.

The square root of 428972869 is about 20711.6602183408. The cubic root of 428972869 is about 754.1827737648.

The spelling of 428972869 in words is "four hundred twenty-eight million, nine hundred seventy-two thousand, eight hundred sixty-nine".