78285236 has 24 divisors (see below), whose sum is σ = 140756616. Its totient is φ = 38074880.

The previous prime is 78285227. The next prime is 78285257. The reversal of 78285236 is 63258287.

It can be written as a sum of positive squares in 4 ways, for example, as 1196836 + 77088400 = 1094^2 + 8780^2 .

It is a super-2 number, since 2×78285236² = 12257156351151392, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a junction number, because it is equal to n+sod(n) for n = 78285193 and 78285202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90920 + ... + 91776.

It is an arithmetic number, because the mean of its divisors is an integer number (5864859).

Almost surely, 2^78285236 is an apocalyptic number.

It is an amenable number.

78285236 is a deficient number, since it is larger than the sum of its proper divisors (62471380).

78285236 is a wasteful number, since it uses less digits than its factorization.

78285236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1459 (or 1457 counting only the distinct ones).

The product of its digits is 161280, while the sum is 41.

The square root of 78285236 is about 8847.8944387916. The cubic root of 78285236 is about 427.7860534346.

The spelling of 78285236 in words is "seventy-eight million, two hundred eighty-five thousand, two hundred thirty-six".