78738228 has 36 divisors (see below), whose sum is σ = 199470180. Its totient is φ = 26188416.

The previous prime is 78738227. The next prime is 78738229. The reversal of 78738228 is 82283787.

It is an interprime number because it is at equal distance from previous prime (78738227) and next prime (78738229).

It can be written as a sum of positive squares in 2 ways, for example, as 53758224 + 24980004 = 7332^2 + 4998^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78738227) 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 11 ways as a sum of consecutive naturals, for example, 16176 + ... + 20472.

Almost surely, 2^78738228 is an apocalyptic number.

It is an amenable number.

78738228 is an abundant number, since it is smaller than the sum of its proper divisors (120731952).

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

78738228 is a wasteful number, since it uses less digits than its factorization.

78738228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4816 (or 4811 counting only the distinct ones).

The product of its digits is 301056, while the sum is 45.

The square root of 78738228 is about 8873.4563728008. The cubic root of 78738228 is about 428.6095849837.

The spelling of 78738228 in words is "seventy-eight million, seven hundred thirty-eight thousand, two hundred twenty-eight".