47810857 has 4 divisors (see below), whose sum is σ = 48154960. Its totient is φ = 47466756.

The previous prime is 47810843. The next prime is 47810863. The reversal of 47810857 is 75801874.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75801874 = 2 ⋅37900937.

It is a cyclic number.

It is not a de Polignac number, because 47810857 - 2⁷ = 47810729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47810837) 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, 171843 + ... + 172120.

It is an arithmetic number, because the mean of its divisors is an integer number (12038740).

Almost surely, 2^47810857 is an apocalyptic number.

It is an amenable number.

47810857 is a deficient number, since it is larger than the sum of its proper divisors (344103).

47810857 is a wasteful number, since it uses less digits than its factorization.

47810857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344102.

The product of its (nonzero) digits is 62720, while the sum is 40.

The square root of 47810857 is about 6914.5395363683. The cubic root of 47810857 is about 362.9461351317.

The spelling of 47810857 in words is "forty-seven million, eight hundred ten thousand, eight hundred fifty-seven".