47878849 has 4 divisors (see below), whose sum is σ = 49423360. Its totient is φ = 46334340.

The previous prime is 47878813. The next prime is 47878867. The reversal of 47878849 is 94887874.

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: 94887874 = 2 ⋅47443937.

It is a cyclic number.

It is not a de Polignac number, because 47878849 - 2¹⁵ = 47846081 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 47878849.

It is not an unprimeable number, because it can be changed into a prime (47878889) 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, 772209 + ... + 772270.

It is an arithmetic number, because the mean of its divisors is an integer number (12355840).

Almost surely, 2^47878849 is an apocalyptic number.

It is an amenable number.

47878849 is a deficient number, since it is larger than the sum of its proper divisors (1544511).

47878849 is a wasteful number, since it uses less digits than its factorization.

47878849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1544510.

The product of its digits is 3612672, while the sum is 55.

The square root of 47878849 is about 6919.4543860047. The cubic root of 47878849 is about 363.1181026613.

The spelling of 47878849 in words is "forty-seven million, eight hundred seventy-eight thousand, eight hundred forty-nine".