89615448781 has 16 divisors (see below), whose sum is σ = 93044193840. Its totient is φ = 86209643520.

The previous prime is 89615448763. The next prime is 89615448787. The reversal of 89615448781 is 18784451698.

It can be written as a sum of positive squares in 8 ways, for example, as 1673546281 + 87941902500 = 40909^2 + 296550^2 .

It is a cyclic number.

It is not a de Polignac number, because 89615448781 - 2⁷ = 89615448653 is a prime.

It is a super-2 number, since 2×89615448781² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (89615448787) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22876635 + ... + 22880551.

It is an arithmetic number, because the mean of its divisors is an integer number (5815262115).

Almost surely, 2^89615448781 is an apocalyptic number.

It is an amenable number.

89615448781 is a deficient number, since it is larger than the sum of its proper divisors (3428745059).

89615448781 is a wasteful number, since it uses less digits than its factorization.

89615448781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6624.

The product of its digits is 15482880, while the sum is 61.

The spelling of 89615448781 in words is "eighty-nine billion, six hundred fifteen million, four hundred forty-eight thousand, seven hundred eighty-one".