531207428 has 6 divisors (see below), whose sum is σ = 929613006. Its totient is φ = 265603712.

The previous prime is 531207421. The next prime is 531207437. The reversal of 531207428 is 824702135.

It can be written as a sum of positive squares in only one way, i.e., 360696064 + 170511364 = 18992^2 + 13058^2 .

It is a junction number, because it is equal to n+sod(n) for n = 531207394 and 531207403.

It is not an unprimeable number, because it can be changed into a prime (531207421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66400925 + ... + 66400932.

It is an arithmetic number, because the mean of its divisors is an integer number (154935501).

Almost surely, 2^531207428 is an apocalyptic number.

It is an amenable number.

531207428 is a deficient number, since it is larger than the sum of its proper divisors (398405578).

531207428 is a wasteful number, since it uses less digits than its factorization.

531207428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132801861 (or 132801859 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 531207428 is about 23047.9376083848. The cubic root of 531207428 is about 809.8813157409.

The spelling of 531207428 in words is "five hundred thirty-one million, two hundred seven thousand, four hundred twenty-eight".