89409681 has 12 divisors (see below), whose sum is σ = 136744452. Its totient is φ = 56100096.

The previous prime is 89409679. The next prime is 89409689. The reversal of 89409681 is 18690498.

It can be written as a sum of positive squares in 2 ways, for example, as 45968400 + 43441281 = 6780^2 + 6591^2 .

It is not a de Polignac number, because 89409681 - 2¹ = 89409679 is a prime.

It is a super-2 number, since 2×89409681² = 15988182113043522, which contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (89409689) 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, 292036 + ... + 292341.

It is an arithmetic number, because the mean of its divisors is an integer number (11395371).

Almost surely, 2^89409681 is an apocalyptic number.

It is an amenable number.

89409681 is a deficient number, since it is larger than the sum of its proper divisors (47334771).

89409681 is a wasteful number, since it uses less digits than its factorization.

89409681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 584400 (or 584397 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The square root of 89409681 is about 9455.6692518298. The cubic root of 89409681 is about 447.1585252188.

The spelling of 89409681 in words is "eighty-nine million, four hundred nine thousand, six hundred eighty-one".