30628778686 has 16 divisors (see below), whose sum is σ = 50941458288. Its totient is φ = 13693939200.

The previous prime is 30628778683. The next prime is 30628778693. The reversal of 30628778686 is 68687782603.

It is a Harshad number since it is a multiple of its sum of digits (61).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30628778681) 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, 11410275 + ... + 11412958.

It is an arithmetic number, because the mean of its divisors is an integer number (3183841143).

Almost surely, 2^30628778686 is an apocalyptic number.

30628778686 is a deficient number, since it is larger than the sum of its proper divisors (20312679602).

30628778686 is a wasteful number, since it uses less digits than its factorization.

30628778686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22823307.

The product of its (nonzero) digits is 32514048, while the sum is 61.

The spelling of 30628778686 in words is "thirty billion, six hundred twenty-eight million, seven hundred seventy-eight thousand, six hundred eighty-six".