428355531 has 12 divisors (see below), whose sum is σ = 621670920. Its totient is φ = 284215680.

The previous prime is 428355523. The next prime is 428355533. The reversal of 428355531 is 135553824.

428355531 is a `hidden beast` number, since 42 + 83 + 5 + 5 + 531 = 666.

It is not a de Polignac number, because 428355531 - 2³ = 428355523 is a prime.

It is a super-2 number, since 2×428355531² = 366976921876583922, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (428355533) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 110886 + ... + 114683.

It is an arithmetic number, because the mean of its divisors is an integer number (51805910).

Almost surely, 2^428355531 is an apocalyptic number.

428355531 is a deficient number, since it is larger than the sum of its proper divisors (193315389).

428355531 is a wasteful number, since it uses less digits than its factorization.

428355531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225786 (or 225783 counting only the distinct ones).

The product of its digits is 72000, while the sum is 36.

The square root of 428355531 is about 20696.7517016560. The cubic root of 428355531 is about 753.8208167583.

The spelling of 428355531 in words is "four hundred twenty-eight million, three hundred fifty-five thousand, five hundred thirty-one".