47781992420 has 24 divisors (see below), whose sum is σ = 101376643704. Its totient is φ = 18915757056.

The previous prime is 47781992387. The next prime is 47781992443. The reversal of 47781992420 is 2429918774.

47781992420 = 19895² + 19896² + ... + 20014².

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 181225444 + 47600766976 = 13462^2 + 218176^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12313007 + ... + 12316886.

It is an arithmetic number, because the mean of its divisors is an integer number (4224026821).

Almost surely, 2^47781992420 is an apocalyptic number.

It is an amenable number.

47781992420 is an abundant number, since it is smaller than the sum of its proper divisors (53594651284).

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

47781992420 is a wasteful number, since it uses less digits than its factorization.

47781992420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24629999 (or 24629997 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 53.

The spelling of 47781992420 in words is "forty-seven billion, seven hundred eighty-one million, nine hundred ninety-two thousand, four hundred twenty".