78889589469 has 20 divisors (see below), whose sum is σ = 117866629980. Its totient is φ = 52584482880.

The previous prime is 78889589461. The next prime is 78889589497. The reversal of 78889589469 is 96498598887.

78889589469 is a `hidden beast` number, since 78 + 8 + 8 + 9 + 5 + 89 + 469 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1399732569 + 77489856900 = 37413^2 + 278370^2 .

It is not a de Polignac number, because 78889589469 - 2³ = 78889589461 is a prime.

It is a super-2 number, since 2×78889589469² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78889589461) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 441289 + ... + 593729.

It is an arithmetic number, because the mean of its divisors is an integer number (5893331499).

Almost surely, 2^78889589469 is an apocalyptic number.

It is an amenable number.

78889589469 is a deficient number, since it is larger than the sum of its proper divisors (38977040511).

78889589469 is a wasteful number, since it uses less digits than its factorization.

78889589469 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158842 (or 158833 counting only the distinct ones).

The product of its digits is 2508226560, while the sum is 81.

The spelling of 78889589469 in words is "seventy-eight billion, eight hundred eighty-nine million, five hundred eighty-nine thousand, four hundred sixty-nine".