47720145 has 16 divisors (see below), whose sum is σ = 83293632. Its totient is φ = 23136960.

The previous prime is 47720143. The next prime is 47720149. The reversal of 47720145 is 54102774.

It is not a de Polignac number, because 47720145 - 2¹ = 47720143 is a prime.

It is not an unprimeable number, because it can be changed into a prime (47720143) 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, 144442 + ... + 144771.

It is an arithmetic number, because the mean of its divisors is an integer number (5205852).

Almost surely, 2^47720145 is an apocalyptic number.

It is an amenable number.

47720145 is a deficient number, since it is larger than the sum of its proper divisors (35573487).

47720145 is a wasteful number, since it uses less digits than its factorization.

47720145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289232.

The product of its (nonzero) digits is 7840, while the sum is 30.

The square root of 47720145 is about 6907.9769107894. The cubic root of 47720145 is about 362.7164494081.

The spelling of 47720145 in words is "forty-seven million, seven hundred twenty thousand, one hundred forty-five".