47581978 has 8 divisors (see below), whose sum is σ = 71419860. Its totient is φ = 23775360.

The previous prime is 47581973. The next prime is 47581979. The reversal of 47581978 is 87918574.

It can be written as a sum of positive squares in 2 ways, for example, as 46881409 + 700569 = 6847^2 + 837^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (47581973) 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, 3543 + ... + 10378.

Almost surely, 2^47581978 is an apocalyptic number.

47581978 is a deficient number, since it is larger than the sum of its proper divisors (23837882).

47581978 is a wasteful number, since it uses less digits than its factorization.

47581978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15632.

The product of its digits is 564480, while the sum is 49.

The square root of 47581978 is about 6897.9691214154. The cubic root of 47581978 is about 362.3660461069.

The spelling of 47581978 in words is "forty-seven million, five hundred eighty-one thousand, nine hundred seventy-eight".