78857742 has 8 divisors (see below), whose sum is σ = 157715496. Its totient is φ = 26285912.

The previous prime is 78857741. The next prime is 78857749. The reversal of 78857742 is 24775887.

It is a happy number.

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

78857742 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 78857691 and 78857700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78857741) 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, 6571473 + ... + 6571484.

It is an arithmetic number, because the mean of its divisors is an integer number (19714437).

Almost surely, 2^78857742 is an apocalyptic number.

78857742 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78857742 is a wasteful number, since it uses less digits than its factorization.

78857742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13142962.

The product of its digits is 878080, while the sum is 48.

The square root of 78857742 is about 8880.1881736819. The cubic root of 78857742 is about 428.8263325180.

The spelling of 78857742 in words is "seventy-eight million, eight hundred fifty-seven thousand, seven hundred forty-two".