47420781 has 4 divisors (see below), whose sum is σ = 63227712. Its totient is φ = 31613852.

The previous prime is 47420767. The next prime is 47420797. The reversal of 47420781 is 18702474.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 47420781 - 2⁵ = 47420749 is a prime.

It is a super-2 number, since 2×47420781² = 4497460941299922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47420761) 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, 7903461 + ... + 7903466.

It is an arithmetic number, because the mean of its divisors is an integer number (15806928).

Almost surely, 2^47420781 is an apocalyptic number.

It is an amenable number.

47420781 is a deficient number, since it is larger than the sum of its proper divisors (15806931).

47420781 is a wasteful number, since it uses less digits than its factorization.

47420781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15806930.

The product of its (nonzero) digits is 12544, while the sum is 33.

The square root of 47420781 is about 6886.2748275102. The cubic root of 47420781 is about 361.9563783502.

The spelling of 47420781 in words is "forty-seven million, four hundred twenty thousand, seven hundred eighty-one".