87487445 has 18 divisors (see below), whose sum is σ = 108484962. Its totient is φ = 67731136.

The previous prime is 87487441. The next prime is 87487447. The reversal of 87487445 is 54478478.

It can be written as a sum of positive squares in 3 ways, for example, as 8836 + 87478609 = 94^2 + 9353^2 .

It is not a de Polignac number, because 87487445 - 2² = 87487441 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 87487445.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87487441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 982961 + ... + 983049.

Almost surely, 2^87487445 is an apocalyptic number.

It is an amenable number.

87487445 is a deficient number, since it is larger than the sum of its proper divisors (20997517).

87487445 is an frugal number, since it uses more digits than its factorization.

87487445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277 (or 141 counting only the distinct ones).

The product of its digits is 1003520, while the sum is 47.

The square root of 87487445 is about 9353.4723498816. The cubic root of 87487445 is about 443.9307662657.

Multiplying 87487445 by its product of digits (1003520), we get a square (87795400806400 = 9369920²).

The spelling of 87487445 in words is "eighty-seven million, four hundred eighty-seven thousand, four hundred forty-five".