3681470781 has 24 divisors (see below), whose sum is σ = 5551518336. Its totient is φ = 2346490080.

The previous prime is 3681470777. The next prime is 3681470797. The reversal of 3681470781 is 1870741863.

3681470781 is a `hidden beast` number, since 36 + 81 + 470 + 78 + 1 = 666.

It is not a de Polignac number, because 3681470781 - 2² = 3681470777 is a prime.

It is a super-2 number, since 2×3681470781² = 27106454222713499922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3681470701) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 830136 + ... + 834558.

It is an arithmetic number, because the mean of its divisors is an integer number (231313264).

Almost surely, 2^3681470781 is an apocalyptic number.

It is an amenable number.

3681470781 is a deficient number, since it is larger than the sum of its proper divisors (1870047555).

3681470781 is a wasteful number, since it uses less digits than its factorization.

3681470781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8473 (or 8470 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 45.

The square root of 3681470781 is about 60675.1248948035. The cubic root of 3681470781 is about 1544.0941798094.

The spelling of 3681470781 in words is "three billion, six hundred eighty-one million, four hundred seventy thousand, seven hundred eighty-one".