78133286 has 16 divisors (see below), whose sum is σ = 146119680. Its totient is φ = 30441480.

The previous prime is 78133283. The next prime is 78133313. The reversal of 78133286 is 68233187.

It is a happy number.

It is a super-2 number, since 2×78133286² = 12209620762315592, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78133283) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 253526 + ... + 253833.

It is an arithmetic number, because the mean of its divisors is an integer number (9132480).

Almost surely, 2^78133286 is an apocalyptic number.

78133286 is a deficient number, since it is larger than the sum of its proper divisors (67986394).

78133286 is a wasteful number, since it uses less digits than its factorization.

78133286 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 507379.

The product of its digits is 48384, while the sum is 38.

The square root of 78133286 is about 8839.3034793472. The cubic root of 78133286 is about 427.5090995863.

Subtracting from 78133286 its reverse (68233187), we obtain a palindrome (9900099).

The spelling of 78133286 in words is "seventy-eight million, one hundred thirty-three thousand, two hundred eighty-six".