87378985 has 4 divisors (see below), whose sum is σ = 104854788. Its totient is φ = 69903184.

The previous prime is 87378983. The next prime is 87378989. The reversal of 87378985 is 58987378.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58987378 = 2 ⋅29493689.

It can be written as a sum of positive squares in 2 ways, for example, as 27331984 + 60047001 = 5228^2 + 7749^2 .

It is a cyclic number.

It is not a de Polignac number, because 87378985 - 2¹ = 87378983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87378983) 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, 8737894 + ... + 8737903.

It is an arithmetic number, because the mean of its divisors is an integer number (26213697).

Almost surely, 2^87378985 is an apocalyptic number.

It is an amenable number.

87378985 is a deficient number, since it is larger than the sum of its proper divisors (17475803).

87378985 is a wasteful number, since it uses less digits than its factorization.

87378985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17475802.

The product of its digits is 3386880, while the sum is 55.

The square root of 87378985 is about 9347.6727050106. The cubic root of 87378985 is about 443.7472403452.

The spelling of 87378985 in words is "eighty-seven million, three hundred seventy-eight thousand, nine hundred eighty-five".