78742838 has 16 divisors (see below), whose sum is σ = 119314944. Its totient is φ = 38973480.

The previous prime is 78742817. The next prime is 78742841. The reversal of 78742838 is 83824787.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 78742792 and 78742801.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 143681 + ... + 144227.

It is an arithmetic number, because the mean of its divisors is an integer number (7457184).

Almost surely, 2^78742838 is an apocalyptic number.

78742838 is a deficient number, since it is larger than the sum of its proper divisors (40572106).

78742838 is a wasteful number, since it uses less digits than its factorization.

78742838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1147.

The product of its digits is 602112, while the sum is 47.

The square root of 78742838 is about 8873.7161324893. The cubic root of 78742838 is about 428.6179496272.

The spelling of 78742838 in words is "seventy-eight million, seven hundred forty-two thousand, eight hundred thirty-eight".