47878138420 has 48 divisors (see below), whose sum is σ = 115924451328. Its totient is φ = 16270087680.

The previous prime is 47878138391. The next prime is 47878138423. The reversal of 47878138420 is 2483187874.

It is a super-2 number, since 2×47878138420² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47878138423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1497396 + ... + 1529035.

It is an arithmetic number, because the mean of its divisors is an integer number (2415092736).

Almost surely, 2^47878138420 is an apocalyptic number.

It is an amenable number.

47878138420 is an abundant number, since it is smaller than the sum of its proper divisors (68046312908).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

47878138420 is a wasteful number, since it uses less digits than its factorization.

47878138420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3026560 (or 3026558 counting only the distinct ones).

The product of its (nonzero) digits is 2408448, while the sum is 52.

The spelling of 47878138420 in words is "forty-seven billion, eight hundred seventy-eight million, one hundred thirty-eight thousand, four hundred twenty".