87645547 has 4 divisors (see below), whose sum is σ = 95613336. Its totient is φ = 79677760.

The previous prime is 87645541. The next prime is 87645559. The reversal of 87645547 is 74554678.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 87645547 - 2²³ = 79256939 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 87645497 and 87645506.

It is not an unprimeable number, because it can be changed into a prime (87645541) 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, 3983878 + ... + 3983899.

It is an arithmetic number, because the mean of its divisors is an integer number (23903334).

Almost surely, 2^87645547 is an apocalyptic number.

87645547 is a deficient number, since it is larger than the sum of its proper divisors (7967789).

87645547 is a wasteful number, since it uses less digits than its factorization.

87645547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7967788.

The product of its digits is 940800, while the sum is 46.

The square root of 87645547 is about 9361.9200487934. The cubic root of 87645547 is about 444.1980202531.

The spelling of 87645547 in words is "eighty-seven million, six hundred forty-five thousand, five hundred forty-seven".