87389847 has 24 divisors (see below), whose sum is σ = 135429840. Its totient is φ = 56246400.

The previous prime is 87389839. The next prime is 87389849. The reversal of 87389847 is 74898378.

It is not a de Polignac number, because 87389847 - 2³ = 87389839 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 87389793 and 87389802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87389849) 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, 847 + ... + 13247.

It is an arithmetic number, because the mean of its divisors is an integer number (5642910).

Almost surely, 2^87389847 is an apocalyptic number.

87389847 is a gapful number since it is divisible by the number (87) formed by its first and last digit.

87389847 is a deficient number, since it is larger than the sum of its proper divisors (48039993).

87389847 is a wasteful number, since it uses less digits than its factorization.

87389847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12445 (or 12433 counting only the distinct ones).

The product of its digits is 2709504, while the sum is 54.

The square root of 87389847 is about 9348.2536871867. The cubic root of 87389847 is about 443.7656268517.

The spelling of 87389847 in words is "eighty-seven million, three hundred eighty-nine thousand, eight hundred forty-seven".