47649891 has 16 divisors (see below), whose sum is σ = 68435840. Its totient is φ = 29393280.

The previous prime is 47649887. The next prime is 47649911. The reversal of 47649891 is 19894674.

47649891 = T₂₉₀ + T₂₉₁ + ... + T₆₇₆.

47649891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 47649891 - 2² = 47649887 is a prime.

It is a super-2 number, since 2×47649891² = 4541024224623762, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 47649891.

It is not an unprimeable number, because it can be changed into a prime (47649841) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 7270 + ... + 12171.

It is an arithmetic number, because the mean of its divisors is an integer number (4277240).

Almost surely, 2^47649891 is an apocalyptic number.

47649891 is a deficient number, since it is larger than the sum of its proper divisors (20785949).

47649891 is a wasteful number, since it uses less digits than its factorization.

47649891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19506.

The product of its digits is 435456, while the sum is 48.

The square root of 47649891 is about 6902.8900469296. The cubic root of 47649891 is about 362.5383639144.

The spelling of 47649891 in words is "forty-seven million, six hundred forty-nine thousand, eight hundred ninety-one".