78857530 has 16 divisors (see below), whose sum is σ = 142572960. Its totient is φ = 31403152.

The previous prime is 78857507. The next prime is 78857539. The reversal of 78857530 is 3575887.

It is not an unprimeable number, because it can be changed into a prime (78857539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15100 + ... + 19639.

It is an arithmetic number, because the mean of its divisors is an integer number (8910810).

Almost surely, 2^78857530 is an apocalyptic number.

78857530 is a deficient number, since it is larger than the sum of its proper divisors (63715430).

78857530 is a wasteful number, since it uses less digits than its factorization.

78857530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34973.

The product of its (nonzero) digits is 235200, while the sum is 43.

The square root of 78857530 is about 8880.1762369899. The cubic root of 78857530 is about 428.8259482341.

The spelling of 78857530 in words is "seventy-eight million, eight hundred fifty-seven thousand, five hundred thirty".