87447645 has 12 divisors (see below), whose sum is σ = 151575996. Its totient is φ = 46638720.

The previous prime is 87447641. The next prime is 87447667. The reversal of 87447645 is 54674478.

It can be written as a sum of positive squares in 2 ways, for example, as 38713284 + 48734361 = 6222^2 + 6981^2 .

It is not a de Polignac number, because 87447645 - 2² = 87447641 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 1943281 = 87447645 / (8 + 7 + 4 + 4 + 7 + 6 + 4 + 5).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 87447645.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87447641) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 971596 + ... + 971685.

It is an arithmetic number, because the mean of its divisors is an integer number (12631333).

Almost surely, 2^87447645 is an apocalyptic number.

It is an amenable number.

87447645 is a deficient number, since it is larger than the sum of its proper divisors (64128351).

87447645 is a wasteful number, since it uses less digits than its factorization.

87447645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1943292 (or 1943289 counting only the distinct ones).

The product of its digits is 752640, while the sum is 45.

The square root of 87447645 is about 9351.3445557310. The cubic root of 87447645 is about 443.8634380358.

The spelling of 87447645 in words is "eighty-seven million, four hundred forty-seven thousand, six hundred forty-five".