78742444 has 18 divisors (see below), whose sum is σ = 151466252. Its totient is φ = 35791800.

The previous prime is 78742439. The next prime is 78742451. The reversal of 78742444 is 44424787.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 78742397 and 78742406.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 80862 + ... + 81829.

Almost surely, 2^78742444 is an apocalyptic number.

It is an amenable number.

78742444 is a deficient number, since it is larger than the sum of its proper divisors (72723808).

78742444 is a wasteful number, since it uses less digits than its factorization.

78742444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162717 (or 162704 counting only the distinct ones).

The product of its digits is 200704, while the sum is 40.

The square root of 78742444 is about 8873.6939320668. The cubic root of 78742444 is about 428.6172347442.

The spelling of 78742444 in words is "seventy-eight million, seven hundred forty-two thousand, four hundred forty-four".