89978563 has 2 divisors, whose sum is σ = 89978564. Its totient is φ = 89978562.

The previous prime is 89978549. The next prime is 89978587. The reversal of 89978563 is 36587998.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 89978563 - 2⁵ = 89978531 is a prime.

It is a super-2 number, since 2×89978563² = 16192283599089938, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (89978533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44989281 + 44989282.

It is an arithmetic number, because the mean of its divisors is an integer number (44989282).

Almost surely, 2^89978563 is an apocalyptic number.

89978563 is a deficient number, since it is larger than the sum of its proper divisors (1).

89978563 is an equidigital number, since it uses as much as digits as its factorization.

89978563 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3265920, while the sum is 55.

The square root of 89978563 is about 9485.7030841156. The cubic root of 89978563 is about 448.1048911365.

The spelling of 89978563 in words is "eighty-nine million, nine hundred seventy-eight thousand, five hundred sixty-three".