309329994078 has 144 divisors (see below), whose sum is σ = 790329852000. Its totient is φ = 87174807552.

The previous prime is 309329994073. The next prime is 309329994089. The reversal of 309329994078 is 870499923903.

309329994078 is a `hidden beast` number, since 30 + 93 + 29 + 99 + 407 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (309329994073) by changing a digit.

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 71 ways as a sum of consecutive naturals, for example, 23340798 + ... + 23354046.

It is an arithmetic number, because the mean of its divisors is an integer number (5488401750).

Almost surely, 2^309329994078 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 309329994078, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (395164926000).

309329994078 is an abundant number, since it is smaller than the sum of its proper divisors (480999857922).

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

309329994078 is a wasteful number, since it uses less digits than its factorization.

309329994078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13631 (or 13621 counting only the distinct ones).

The product of its (nonzero) digits is 26453952, while the sum is 63.

The spelling of 309329994078 in words is "three hundred nine billion, three hundred twenty-nine million, nine hundred ninety-four thousand, seventy-eight".