329628780 has 72 divisors (see below), whose sum is σ = 1076794992. Its totient is φ = 81138816.

The previous prime is 329628779. The next prime is 329628781. The reversal of 329628780 is 87826923.

329628780 is a `hidden beast` number, since 3 + 296 + 287 + 80 = 666.

It is an interprime number because it is at equal distance from previous prime (329628779) and next prime (329628781).

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (329628781) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 68094 + ... + 72773.

It is an arithmetic number, because the mean of its divisors is an integer number (14955486).

Almost surely, 2^329628780 is an apocalyptic number.

329628780 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

329628780 is an abundant number, since it is smaller than the sum of its proper divisors (747166212).

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

329628780 is a wasteful number, since it uses less digits than its factorization.

329628780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140895 (or 140890 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The square root of 329628780 is about 18155.6817553073. The cubic root of 329628780 is about 690.7831058478.

The spelling of 329628780 in words is "three hundred twenty-nine million, six hundred twenty-eight thousand, seven hundred eighty".