89678021 has 4 divisors (see below), whose sum is σ = 91586112. Its totient is φ = 87769932.

The previous prime is 89678011. The next prime is 89678023. The reversal of 89678021 is 12087698.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-89678021 is a prime.

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 89678021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (89678023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 953975 + ... + 954068.

It is an arithmetic number, because the mean of its divisors is an integer number (22896528).

Almost surely, 2^89678021 is an apocalyptic number.

It is an amenable number.

89678021 is a deficient number, since it is larger than the sum of its proper divisors (1908091).

89678021 is a wasteful number, since it uses less digits than its factorization.

89678021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1908090.

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 89678021 is about 9469.8479924442. The cubic root of 89678021 is about 447.6054219341.

The spelling of 89678021 in words is "eighty-nine million, six hundred seventy-eight thousand, twenty-one".