78634642 has 8 divisors (see below), whose sum is σ = 118281600. Its totient is φ = 39207444.

The previous prime is 78634627. The next prime is 78634643. The reversal of 78634642 is 24643687.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 78634595 and 78634604.

It is not an unprimeable number, because it can be changed into a prime (78634643) 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, 54042 + ... + 55477.

It is an arithmetic number, because the mean of its divisors is an integer number (14785200).

Almost surely, 2^78634642 is an apocalyptic number.

78634642 is a deficient number, since it is larger than the sum of its proper divisors (39646958).

78634642 is a wasteful number, since it uses less digits than its factorization.

78634642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109880.

The product of its digits is 193536, while the sum is 40.

The square root of 78634642 is about 8867.6176056481. The cubic root of 78634642 is about 428.4215465622.

The spelling of 78634642 in words is "seventy-eight million, six hundred thirty-four thousand, six hundred forty-two".