47278891 has 4 divisors (see below), whose sum is σ = 51576984. Its totient is φ = 42980800.

The previous prime is 47278877. The next prime is 47278901. The reversal of 47278891 is 19887274.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 47278891 - 2¹¹ = 47276843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47278841) 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, 2149030 + ... + 2149051.

It is an arithmetic number, because the mean of its divisors is an integer number (12894246).

Almost surely, 2^47278891 is an apocalyptic number.

47278891 is a deficient number, since it is larger than the sum of its proper divisors (4298093).

47278891 is a wasteful number, since it uses less digits than its factorization.

47278891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4298092.

The product of its digits is 225792, while the sum is 46.

The square root of 47278891 is about 6875.9647323121. The cubic root of 47278891 is about 361.5950086558.

The spelling of 47278891 in words is "forty-seven million, two hundred seventy-eight thousand, eight hundred ninety-one".