47720638 has 16 divisors (see below), whose sum is σ = 83803104. Its totient is φ = 19952640.

The previous prime is 47720627. The next prime is 47720657. The reversal of 47720638 is 83602774.

47720638 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×47720638² = 4554518582254088, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 47720597 and 47720606.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40995 + ... + 42142.

It is an arithmetic number, because the mean of its divisors is an integer number (5237694).

Almost surely, 2^47720638 is an apocalyptic number.

47720638 is a deficient number, since it is larger than the sum of its proper divisors (36082466).

47720638 is a wasteful number, since it uses less digits than its factorization.

47720638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83187.

The product of its (nonzero) digits is 56448, while the sum is 37.

The square root of 47720638 is about 6908.0125940823. The cubic root of 47720638 is about 362.7176984864.

It can be divided in two parts, 477 and 20638, that added together give a triangular number (21115 = T₂₀₅).

The spelling of 47720638 in words is "forty-seven million, seven hundred twenty thousand, six hundred thirty-eight".