89709981 has 8 divisors (see below), whose sum is σ = 122158464. Its totient is φ = 58534080.

The previous prime is 89709931. The next prime is 89709989. The reversal of 89709981 is 18990798.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 89709981 - 2⁷ = 89709853 is a prime.

It is a super-2 number, since 2×89709981² = 16095761382040722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (89709989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 317980 + ... + 318261.

It is an arithmetic number, because the mean of its divisors is an integer number (15269808).

Almost surely, 2^89709981 is an apocalyptic number.

It is an amenable number.

89709981 is a deficient number, since it is larger than the sum of its proper divisors (32448483).

89709981 is a wasteful number, since it uses less digits than its factorization.

89709981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 636291.

The product of its (nonzero) digits is 326592, while the sum is 51.

The square root of 89709981 is about 9471.5353032125. The cubic root of 89709981 is about 447.6585890685.

The spelling of 89709981 in words is "eighty-nine million, seven hundred nine thousand, nine hundred eighty-one".