47978587 has 4 divisors (see below), whose sum is σ = 48999456. Its totient is φ = 46957720.

The previous prime is 47978551. The next prime is 47978597. The reversal of 47978587 is 78587974.

It is a happy number.

47978587 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-47978587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47978507) 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 3 ways as a sum of consecutive naturals, for example, 510364 + ... + 510457.

It is an arithmetic number, because the mean of its divisors is an integer number (12249864).

Almost surely, 2^47978587 is an apocalyptic number.

47978587 is a gapful number since it is divisible by the number (47) formed by its first and last digit.

47978587 is a deficient number, since it is larger than the sum of its proper divisors (1020869).

47978587 is a wasteful number, since it uses less digits than its factorization.

47978587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1020868.

The product of its digits is 3951360, while the sum is 55.

The square root of 47978587 is about 6926.6577077260. The cubic root of 47978587 is about 363.3700688572.

The spelling of 47978587 in words is "forty-seven million, nine hundred seventy-eight thousand, five hundred eighty-seven".