78521682 has 16 divisors (see below), whose sum is σ = 157210560. Its totient is φ = 26146032.

The previous prime is 78521671. The next prime is 78521689. The reversal of 78521682 is 28612587.

It is a self number, because there is not a number n which added to its sum of digits gives 78521682.

It is not an unprimeable number, because it can be changed into a prime (78521689) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 382 + ... + 12537.

It is an arithmetic number, because the mean of its divisors is an integer number (9825660).

Almost surely, 2^78521682 is an apocalyptic number.

78521682 is an abundant number, since it is smaller than the sum of its proper divisors (78688878).

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

78521682 is a wasteful number, since it uses less digits than its factorization.

78521682 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13937.

The product of its digits is 53760, while the sum is 39.

The square root of 78521682 is about 8861.2460749039. The cubic root of 78521682 is about 428.2163033075.

The spelling of 78521682 in words is "seventy-eight million, five hundred twenty-one thousand, six hundred eighty-two".