87387145 has 4 divisors (see below), whose sum is σ = 104864580. Its totient is φ = 69909712.

The previous prime is 87387103. The next prime is 87387149. The reversal of 87387145 is 54178378.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54178378 = 2 ⋅27089189.

It can be written as a sum of positive squares in 2 ways, for example, as 30173049 + 57214096 = 5493^2 + 7564^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87387145 is a prime.

It is a super-2 number, since 2×87387145² = 15273026222502050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (87387149) 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, 8738710 + ... + 8738719.

It is an arithmetic number, because the mean of its divisors is an integer number (26216145).

Almost surely, 2^87387145 is an apocalyptic number.

It is an amenable number.

87387145 is a deficient number, since it is larger than the sum of its proper divisors (17477435).

87387145 is a wasteful number, since it uses less digits than its factorization.

87387145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17477434.

The product of its digits is 188160, while the sum is 43.

The square root of 87387145 is about 9348.1091670990. The cubic root of 87387145 is about 443.7610532194.

The spelling of 87387145 in words is "eighty-seven million, three hundred eighty-seven thousand, one hundred forty-five".