538720651440 has 200 divisors, whose sum is σ = 1910867428800. Its totient is φ = 140602189824.

The previous prime is 538720651387. The next prime is 538720651499. The reversal of 538720651440 is 44156027835.

538720651440 is a `hidden beast` number, since 53 + 87 + 2 + 0 + 6 + 514 + 4 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 579865 + ... + 1188984.

It is an arithmetic number, because the mean of its divisors is an integer number (9554337144).

Almost surely, 2^538720651440 is an apocalyptic number.

It is an amenable number.

538720651440 is an abundant number, since it is smaller than the sum of its proper divisors (1372146777360).

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

538720651440 is a wasteful number, since it uses less digits than its factorization.

538720651440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1768921 (or 1768906 counting only the distinct ones).

The product of its (nonzero) digits is 806400, while the sum is 45.

The spelling of 538720651440 in words is "five hundred thirty-eight billion, seven hundred twenty million, six hundred fifty-one thousand, four hundred forty".