78578253 has 12 divisors (see below), whose sum is σ = 122233020. Its totient is φ = 48355776.

The previous prime is 78578251. The next prime is 78578257. The reversal of 78578253 is 35287587.

78578253 is a `hidden beast` number, since 78 + 578 + 2 + 5 + 3 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 28068804 + 50509449 = 5298^2 + 7107^2 .

It is not a de Polignac number, because 78578253 - 2¹ = 78578251 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 78578199 and 78578208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78578251) 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, 335688 + ... + 335921.

It is an arithmetic number, because the mean of its divisors is an integer number (10186085).

Almost surely, 2^78578253 is an apocalyptic number.

It is an amenable number.

78578253 is a deficient number, since it is larger than the sum of its proper divisors (43654767).

78578253 is a wasteful number, since it uses less digits than its factorization.

78578253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 671628 (or 671625 counting only the distinct ones).

The product of its digits is 470400, while the sum is 45.

The square root of 78578253 is about 8864.4375456089. The cubic root of 78578253 is about 428.3191148650.

It can be divided in two parts, 7857 and 8253, that added together give a triangular number (16110 = T₁₇₉).

The spelling of 78578253 in words is "seventy-eight million, five hundred seventy-eight thousand, two hundred fifty-three".