631481200928 has 18 divisors (see below), whose sum is σ = 1243237464441. Its totient is φ = 315738352832.

The previous prime is 631481200921. The next prime is 631481200937. The reversal of 631481200928 is 829002184136.

It is a happy number.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 2 ways, for example, as 481486107664 + 149995093264 = 693892^2 + 387292^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=561908.

It is a super-2 number, since 2×631481200928² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (631481200921) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 4425026 + ... + 4565502.

Almost surely, 2^631481200928 is an apocalyptic number.

It is an amenable number.

631481200928 is a deficient number, since it is larger than the sum of its proper divisors (611756263513).

631481200928 is an frugal number, since it uses more digits than its factorization.

631481200928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280964 (or 140479 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 44.

The spelling of 631481200928 in words is "six hundred thirty-one billion, four hundred eighty-one million, two hundred thousand, nine hundred twenty-eight".