47420645 has 4 divisors (see below), whose sum is σ = 56904780. Its totient is φ = 37936512.

The previous prime is 47420629. The next prime is 47420647. The reversal of 47420645 is 54602474.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54602474 = 2 ⋅27301237.

It can be written as a sum of positive squares in 2 ways, for example, as 26863489 + 20557156 = 5183^2 + 4534^2 .

It is a cyclic number.

It is not a de Polignac number, because 47420645 - 2⁴ = 47420629 is a prime.

It is a super-4 number, since 4×47420645⁴ (a number of 32 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47420647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4742060 + ... + 4742069.

It is an arithmetic number, because the mean of its divisors is an integer number (14226195).

Almost surely, 2^47420645 is an apocalyptic number.

It is an amenable number.

47420645 is a deficient number, since it is larger than the sum of its proper divisors (9484135).

47420645 is an equidigital number, since it uses as much as digits as its factorization.

47420645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9484134.

The product of its (nonzero) digits is 26880, while the sum is 32.

The square root of 47420645 is about 6886.2649527883. The cubic root of 47420645 is about 361.9560323267.

The spelling of 47420645 in words is "forty-seven million, four hundred twenty thousand, six hundred forty-five".