47687831 has 4 divisors (see below), whose sum is σ = 47731200. Its totient is φ = 47644464.

The previous prime is 47687821. The next prime is 47687833. The reversal of 47687831 is 13878674.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13878674 = 2 ⋅6939337.

It is a cyclic number.

It is not a de Polignac number, because 47687831 - 2⁶ = 47687767 is a prime.

It is a super-2 number, since 2×47687831² = 4548258450969122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47687833) 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, 19991 + ... + 22248.

It is an arithmetic number, because the mean of its divisors is an integer number (11932800).

Almost surely, 2^47687831 is an apocalyptic number.

47687831 is a deficient number, since it is larger than the sum of its proper divisors (43369).

47687831 is a wasteful number, since it uses less digits than its factorization.

47687831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43368.

The product of its digits is 225792, while the sum is 44.

The square root of 47687831 is about 6905.6376244341. The cubic root of 47687831 is about 362.6345590035.

The spelling of 47687831 in words is "forty-seven million, six hundred eighty-seven thousand, eight hundred thirty-one".