5627720781 has 16 divisors (see below), whose sum is σ = 8345249920. Its totient is φ = 3748265280.

The previous prime is 5627720779. The next prime is 5627720843. The reversal of 5627720781 is 1870277265.

5627720781 is a `hidden beast` number, since 562 + 7 + 7 + 2 + 0 + 7 + 81 = 666.

It is not a de Polignac number, because 5627720781 - 2¹ = 5627720779 is a prime.

It is a super-2 number, since 2×5627720781² = 63342482377798499922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5627720701) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69340 + ... + 126741.

It is an arithmetic number, because the mean of its divisors is an integer number (521578120).

Almost surely, 2^5627720781 is an apocalyptic number.

It is an amenable number.

5627720781 is a deficient number, since it is larger than the sum of its proper divisors (2717529139).

5627720781 is a wasteful number, since it uses less digits than its factorization.

5627720781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197153 (or 197147 counting only the distinct ones).

The product of its (nonzero) digits is 329280, while the sum is 45.

The square root of 5627720781 is about 75018.1363471527. The cubic root of 5627720781 is about 1778.7333475878.

The spelling of 5627720781 in words is "five billion, six hundred twenty-seven million, seven hundred twenty thousand, seven hundred eighty-one".