78621787982 has 16 divisors (see below), whose sum is σ = 120764148912. Its totient is φ = 38368417920.

The previous prime is 78621787949. The next prime is 78621787991. The reversal of 78621787982 is 28978712687.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 218813 + ... + 452904.

It is an arithmetic number, because the mean of its divisors is an integer number (7547759307).

Almost surely, 2^78621787982 is an apocalyptic number.

78621787982 is a deficient number, since it is larger than the sum of its proper divisors (42142360930).

78621787982 is a wasteful number, since it uses less digits than its factorization.

78621787982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 673123.

The product of its digits is 37933056, while the sum is 65.

The spelling of 78621787982 in words is "seventy-eight billion, six hundred twenty-one million, seven hundred eighty-seven thousand, nine hundred eighty-two".