78294228 has 24 divisors (see below), whose sum is σ = 186936288. Its totient is φ = 25490976.

The previous prime is 78294221. The next prime is 78294233. The reversal of 78294228 is 82249287.

It is a super-2 number, since 2×78294228² = 12259972276231968, 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 78294228.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78294221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75351 + ... + 76382.

It is an arithmetic number, because the mean of its divisors is an integer number (7789012).

Almost surely, 2^78294228 is an apocalyptic number.

It is an amenable number.

78294228 is an abundant number, since it is smaller than the sum of its proper divisors (108642060).

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

78294228 is a wasteful number, since it uses less digits than its factorization.

78294228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151783 (or 151781 counting only the distinct ones).

The product of its digits is 129024, while the sum is 42.

The square root of 78294228 is about 8848.4025676955. The cubic root of 78294228 is about 427.8024315970.

The spelling of 78294228 in words is "seventy-eight million, two hundred ninety-four thousand, two hundred twenty-eight".