78521242 has 8 divisors (see below), whose sum is σ = 118122336. Its totient is φ = 39147132.

The previous prime is 78521227. The next prime is 78521293. The reversal of 78521242 is 24212587.

It is a happy number.

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

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 55878 + ... + 57265.

It is an arithmetic number, because the mean of its divisors is an integer number (14765292).

Almost surely, 2^78521242 is an apocalyptic number.

78521242 is a deficient number, since it is larger than the sum of its proper divisors (39601094).

78521242 is a wasteful number, since it uses less digits than its factorization.

78521242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113492.

The product of its digits is 8960, while the sum is 31.

The square root of 78521242 is about 8861.2212476611. The cubic root of 78521242 is about 428.2155034624.

The spelling of 78521242 in words is "seventy-eight million, five hundred twenty-one thousand, two hundred forty-two".