47667781 has 4 divisors (see below), whose sum is σ = 54477472. Its totient is φ = 40858092.

The previous prime is 47667769. The next prime is 47667787. The reversal of 47667781 is 18776674.

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 47667781 - 2⁵ = 47667749 is a prime.

It is a super-2 number, since 2×47667781² = 4544434690927922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47667787) 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, 3404835 + ... + 3404848.

It is an arithmetic number, because the mean of its divisors is an integer number (13619368).

Almost surely, 2^47667781 is an apocalyptic number.

It is an amenable number.

47667781 is a deficient number, since it is larger than the sum of its proper divisors (6809691).

47667781 is an equidigital number, since it uses as much as digits as its factorization.

47667781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6809690.

The product of its digits is 395136, while the sum is 46.

The square root of 47667781 is about 6904.1857593781. The cubic root of 47667781 is about 362.5837295292.

The spelling of 47667781 in words is "forty-seven million, six hundred sixty-seven thousand, seven hundred eighty-one".