87945389 has 16 divisors (see below), whose sum is σ = 102318720. Its totient is φ = 74036160.

The previous prime is 87945383. The next prime is 87945397. The reversal of 87945389 is 98354978.

It is a cyclic number.

It is not a de Polignac number, because 87945389 - 2¹⁶ = 87879853 is a prime.

It is a super-2 number, since 2×87945389² = 15468782892722642, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 87945389.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87945383) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 132719 + ... + 133379.

It is an arithmetic number, because the mean of its divisors is an integer number (6394920).

Almost surely, 2^87945389 is an apocalyptic number.

It is an amenable number.

87945389 is a deficient number, since it is larger than the sum of its proper divisors (14373331).

87945389 is a wasteful number, since it uses less digits than its factorization.

87945389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 980.

The product of its digits is 2177280, while the sum is 53.

The square root of 87945389 is about 9377.9202918344. The cubic root of 87945389 is about 444.7039886371.

The spelling of 87945389 in words is "eighty-seven million, nine hundred forty-five thousand, three hundred eighty-nine".