78621030784 has 16 divisors (see below), whose sum is σ = 156627835020. Its totient is φ = 39310515328.

The previous prime is 78621030781. The next prime is 78621030793. The reversal of 78621030784 is 48703012687.

It is a tau number, because it is divible by the number of its divisors (16).

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78621030781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 307113274 + ... + 307113529.

Almost surely, 2^78621030784 is an apocalyptic number.

It is an amenable number.

78621030784 is a deficient number, since it is larger than the sum of its proper divisors (78006804236).

78621030784 is an equidigital number, since it uses as much as digits as its factorization.

78621030784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 614226817 (or 614226805 counting only the distinct ones).

The product of its (nonzero) digits is 451584, while the sum is 46.

The spelling of 78621030784 in words is "seventy-eight billion, six hundred twenty-one million, thirty thousand, seven hundred eighty-four".