89278639 has 4 divisors (see below), whose sum is σ = 90611224. Its totient is φ = 87946056.

The previous prime is 89278619. The next prime is 89278661. The reversal of 89278639 is 93687298.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93687298 = 2 ⋅46843649.

It is a cyclic number.

It is not a de Polignac number, because 89278639 - 2⁹ = 89278127 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (89278619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 666192 + ... + 666325.

It is an arithmetic number, because the mean of its divisors is an integer number (22652806).

Almost surely, 2^89278639 is an apocalyptic number.

89278639 is a deficient number, since it is larger than the sum of its proper divisors (1332585).

89278639 is a wasteful number, since it uses less digits than its factorization.

89278639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1332584.

The product of its digits is 1306368, while the sum is 52.

The square root of 89278639 is about 9448.7374288843. The cubic root of 89278639 is about 446.9399612737.

The spelling of 89278639 in words is "eighty-nine million, two hundred seventy-eight thousand, six hundred thirty-nine".