129649776 has 60 divisors (see below), whose sum is σ = 344399832. Its totient is φ = 42027264.

The previous prime is 129649733. The next prime is 129649777. The reversal of 129649776 is 677946921.

It is a Smith number, since the sum of its digits (51) 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 (129649777) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 64726 + ... + 66698.

Almost surely, 2^129649776 is an apocalyptic number.

129649776 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129649776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (172199916).

129649776 is an abundant number, since it is smaller than the sum of its proper divisors (214750056).

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

129649776 is a wasteful number, since it uses less digits than its factorization.

129649776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2058 (or 2015 counting only the distinct ones).

The product of its digits is 1143072, while the sum is 51.

The square root of 129649776 is about 11386.3855546877. The cubic root of 129649776 is about 506.1243790123.

The spelling of 129649776 in words is "one hundred twenty-nine million, six hundred forty-nine thousand, seven hundred seventy-six".