78407642 has 8 divisors (see below), whose sum is σ = 123801600. Its totient is φ = 37140444.

The previous prime is 78407639. The next prime is 78407647. The reversal of 78407642 is 24670487.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×78407642² = 12295516648000328, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (38), and also a Moran number because the ratio is a prime number: 2063359 = 78407642 / (7 + 8 + 4 + 0 + 7 + 6 + 4 + 2).

It is a junction number, because it is equal to n+sod(n) for n = 78407596 and 78407605.

It is not an unprimeable number, because it can be changed into a prime (78407647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1031642 + ... + 1031717.

It is an arithmetic number, because the mean of its divisors is an integer number (15475200).

Almost surely, 2^78407642 is an apocalyptic number.

78407642 is a deficient number, since it is larger than the sum of its proper divisors (45393958).

78407642 is a wasteful number, since it uses less digits than its factorization.

78407642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2063380.

The product of its (nonzero) digits is 75264, while the sum is 38.

The square root of 78407642 is about 8854.8089759181. The cubic root of 78407642 is about 428.0088979721.

The spelling of 78407642 in words is "seventy-eight million, four hundred seven thousand, six hundred forty-two".