531457640 has 128 divisors (see below), whose sum is σ = 1437384960. Its totient is φ = 173021184.

The previous prime is 531457631. The next prime is 531457643. The reversal of 531457640 is 46754135.

It is a super-2 number, since 2×531457640² = 564894446228739200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 531457640.

It is not an unprimeable number, because it can be changed into a prime (531457643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 444884 + ... + 446076.

It is an arithmetic number, because the mean of its divisors is an integer number (11229570).

Almost surely, 2^531457640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 531457640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (718692480).

531457640 is an abundant number, since it is smaller than the sum of its proper divisors (905927320).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

531457640 is a wasteful number, since it uses less digits than its factorization.

531457640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1291 (or 1287 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 35.

The square root of 531457640 is about 23053.3650472117. The cubic root of 531457640 is about 810.0084539076.

The spelling of 531457640 in words is "five hundred thirty-one million, four hundred fifty-seven thousand, six hundred forty".