129678645 has 8 divisors (see below), whose sum is σ = 207485856. Its totient is φ = 69161936.

The previous prime is 129678641. The next prime is 129678671. The reversal of 129678645 is 546876921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 129678645 - 2² = 129678641 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 129678594 and 129678603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129678641) 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, 4322607 + ... + 4322636.

It is an arithmetic number, because the mean of its divisors is an integer number (25935732).

Almost surely, 2^129678645 is an apocalyptic number.

129678645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

129678645 is a deficient number, since it is larger than the sum of its proper divisors (77807211).

129678645 is an equidigital number, since it uses as much as digits as its factorization.

129678645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8645251.

The product of its digits is 725760, while the sum is 48.

The square root of 129678645 is about 11387.6531822848. The cubic root of 129678645 is about 506.1619423124.

It can be divided in two parts, 12967 and 8645, that added together give a palindrome (21612).

The spelling of 129678645 in words is "one hundred twenty-nine million, six hundred seventy-eight thousand, six hundred forty-five".