78721402386 has 32 divisors (see below), whose sum is σ = 172131686208. Its totient is φ = 23802762240.

The previous prime is 78721402369. The next prime is 78721402411. The reversal of 78721402386 is 68320412787.

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 15 ways as a sum of consecutive naturals, for example, 1274815 + ... + 1335138.

It is an arithmetic number, because the mean of its divisors is an integer number (5379115194).

Almost surely, 2^78721402386 is an apocalyptic number.

78721402386 is an abundant number, since it is smaller than the sum of its proper divisors (93410283822).

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

78721402386 is a wasteful number, since it uses less digits than its factorization.

78721402386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2610426.

The product of its (nonzero) digits is 903168, while the sum is 48.

The spelling of 78721402386 in words is "seventy-eight billion, seven hundred twenty-one million, four hundred two thousand, three hundred eighty-six".