47807781 has 24 divisors (see below), whose sum is σ = 78058080. Its totient is φ = 25879392.

The previous prime is 47807729. The next prime is 47807801. The reversal of 47807781 is 18770874.

It is not a de Polignac number, because 47807781 - 2⁶ = 47807717 is a prime.

It is a super-2 number, since 2×47807781² = 4571167848287922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47807581) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5766 + ... + 11351.

It is an arithmetic number, because the mean of its divisors is an integer number (3252420).

Almost surely, 2^47807781 is an apocalyptic number.

It is an amenable number.

47807781 is a deficient number, since it is larger than the sum of its proper divisors (30250299).

47807781 is a wasteful number, since it uses less digits than its factorization.

47807781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17153 (or 17146 counting only the distinct ones).

The product of its (nonzero) digits is 87808, while the sum is 42.

The square root of 47807781 is about 6914.3171029394. The cubic root of 47807781 is about 362.9383513609.

It can be divided in two parts, 4780 and 7781, that added together give a triangular number (12561 = T₁₅₈).

The spelling of 47807781 in words is "forty-seven million, eight hundred seven thousand, seven hundred eighty-one".