47694628881 has 9 divisors (see below), whose sum is σ = 68893188091. Its totient is φ = 31795982472.

The previous prime is 47694628879. The next prime is 47694628901. The reversal of 47694628881 is 18882649674.

The square root of 47694628881 is 218391.

It is a perfect power (a square), and thus also a powerful number.

47694628881 is a `hidden beast` number, since 476 + 9 + 4 + 6 + 2 + 88 + 81 = 666.

It can be written as a sum of positive squares in only one way, i.e., 28461377025 + 19233251856 = 168705^2 + 138684^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 47694628881 - 2¹ = 47694628879 is a prime.

It is a super-2 number, since 2×47694628881² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47694668881) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 618775 + ... + 691571.

Almost surely, 2^47694628881 is an apocalyptic number.

47694628881 is the 218391-st square number.

47694628881 is the 109196-th centered octagonal number.

It is an amenable number.

47694628881 is a deficient number, since it is larger than the sum of its proper divisors (21198559210).

47694628881 is an frugal number, since it uses more digits than its factorization.

47694628881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145600 (or 72800 counting only the distinct ones).

The product of its digits is 37158912, while the sum is 63.

The spelling of 47694628881 in words is "forty-seven billion, six hundred ninety-four million, six hundred twenty-eight thousand, eight hundred eighty-one".