78785361 has 24 divisors (see below), whose sum is σ = 120864744. Its totient is φ = 49282560.

The previous prime is 78785359. The next prime is 78785407. The reversal of 78785361 is 16358787.

It can be written as a sum of positive squares in 4 ways, for example, as 2047761 + 76737600 = 1431^2 + 8760^2 .

It is not a de Polignac number, because 78785361 - 2¹ = 78785359 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78785341) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 69975 + ... + 71091.

It is an arithmetic number, because the mean of its divisors is an integer number (5036031).

Almost surely, 2^78785361 is an apocalyptic number.

It is an amenable number.

78785361 is a deficient number, since it is larger than the sum of its proper divisors (42079383).

78785361 is a wasteful number, since it uses less digits than its factorization.

78785361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1601 (or 1598 counting only the distinct ones).

The product of its digits is 282240, while the sum is 45.

The square root of 78785361 is about 8876.1118176823. Note that the first 3 decimals coincide. The cubic root of 78785361 is about 428.6950903623.

The spelling of 78785361 in words is "seventy-eight million, seven hundred eighty-five thousand, three hundred sixty-one".