89840781 has 12 divisors (see below), whose sum is σ = 129888252. Its totient is φ = 59839296.

The previous prime is 89840771. The next prime is 89840791. The reversal of 89840781 is 18704898.

It is an interprime number because it is at equal distance from previous prime (89840771) and next prime (89840791).

It can be written as a sum of positive squares in 2 ways, for example, as 20385225 + 69455556 = 4515^2 + 8334^2 .

It is not a de Polignac number, because 89840781 - 2⁵ = 89840749 is a prime.

It is a super-2 number, since 2×89840781² = 16142731861379922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (89840701) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7585 + ... + 15401.

It is an arithmetic number, because the mean of its divisors is an integer number (10824021).

Almost surely, 2^89840781 is an apocalyptic number.

It is an amenable number.

89840781 is a deficient number, since it is larger than the sum of its proper divisors (40047471).

89840781 is a wasteful number, since it uses less digits than its factorization.

89840781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9100 (or 9097 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 45.

The square root of 89840781 is about 9478.4376877205. The cubic root of 89840781 is about 447.8760502254.

The spelling of 89840781 in words is "eighty-nine million, eight hundred forty thousand, seven hundred eighty-one".