78785842 has 4 divisors (see below), whose sum is σ = 118178766. Its totient is φ = 39392920.

The previous prime is 78785821. The next prime is 78785843. The reversal of 78785842 is 24858787.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 70543201 + 8242641 = 8399^2 + 2871^2 .

It is not an unprimeable number, because it can be changed into a prime (78785843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19696459 + ... + 19696462.

Almost surely, 2^78785842 is an apocalyptic number.

78785842 is a deficient number, since it is larger than the sum of its proper divisors (39392924).

78785842 is a wasteful number, since it uses less digits than its factorization.

78785842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39392923.

The product of its digits is 1003520, while the sum is 49.

The square root of 78785842 is about 8876.1389128382. The cubic root of 78785842 is about 428.6959627829.

The spelling of 78785842 in words is "seventy-eight million, seven hundred eighty-five thousand, eight hundred forty-two".