78894428 has 6 divisors (see below), whose sum is σ = 138065256. Its totient is φ = 39447212.

The previous prime is 78894427. The next prime is 78894437. The reversal of 78894428 is 82449887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78894421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9861800 + ... + 9861807.

It is an arithmetic number, because the mean of its divisors is an integer number (23010876).

Almost surely, 2^78894428 is an apocalyptic number.

It is an amenable number.

78894428 is a deficient number, since it is larger than the sum of its proper divisors (59170828).

78894428 is a wasteful number, since it uses less digits than its factorization.

78894428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19723611 (or 19723609 counting only the distinct ones).

The product of its digits is 1032192, while the sum is 50.

The square root of 78894428 is about 8882.2535428798. The cubic root of 78894428 is about 428.8928213770.

The spelling of 78894428 in words is "seventy-eight million, eight hundred ninety-four thousand, four hundred twenty-eight".