78336225 has 72 divisors (see below), whose sum is σ = 158156544. Its totient is φ = 36720000.

The previous prime is 78336211. The next prime is 78336283. The reversal of 78336225 is 52263387.

It is not a de Polignac number, because 78336225 - 2⁶ = 78336161 is a prime.

It is a super-2 number, since 2×78336225² = 12273128294501250, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78336225.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 76215 + ... + 77235.

Almost surely, 2^78336225 is an apocalyptic number.

78336225 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

78336225 is an abundant number, since it is smaller than the sum of its proper divisors (79820319).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78336225 is a wasteful number, since it uses less digits than its factorization.

78336225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1079 (or 1071 counting only the distinct ones).

The product of its digits is 60480, while the sum is 36.

The square root of 78336225 is about 8850.7753897611. The cubic root of 78336225 is about 427.8789089557.

It can be divided in two parts, 783362 and 25, that added together give a palindrome (783387).

The spelling of 78336225 in words is "seventy-eight million, three hundred thirty-six thousand, two hundred twenty-five".