78873242 has 12 divisors (see below), whose sum is σ = 137625930. Its totient is φ = 33802776.

The previous prime is 78873239. The next prime is 78873247. The reversal of 78873242 is 24237887.

It can be written as a sum of positive squares in only one way, i.e., 56415121 + 22458121 = 7511^2 + 4739^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 78873242.

It is not an unprimeable number, because it can be changed into a prime (78873247) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 402317 + ... + 402512.

Almost surely, 2^78873242 is an apocalyptic number.

78873242 is a deficient number, since it is larger than the sum of its proper divisors (58752688).

78873242 is a wasteful number, since it uses less digits than its factorization.

78873242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 804845 (or 804838 counting only the distinct ones).

The product of its digits is 150528, while the sum is 41.

The square root of 78873242 is about 8881.0608600550. The cubic root of 78873242 is about 428.8544268751.

The spelling of 78873242 in words is "seventy-eight million, eight hundred seventy-three thousand, two hundred forty-two".